diff --git a/java/res/values-zh-rTW/strings-letter-descriptions.xml b/java/res/values-zh-rTW/strings-letter-descriptions.xml
new file mode 100644
index 0000000..c38aa38
--- /dev/null
+++ b/java/res/values-zh-rTW/strings-letter-descriptions.xml
@@ -0,0 +1,208 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- 
+/*
+**
+** Copyright 2014, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+ -->
+
+<!-- 
+    These accented letters (spoken_accented_letter_*) are unsupported by TTS.
+    These symbols (spoken_symbol_*) are also unsupported by TTS.
+    TODO: Remove these string resources when TTS/TalkBack support these letters.
+ -->
+
+<resources xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <string name="spoken_accented_letter_00AA" msgid="4374325261868451570">"雌性符號"</string>
+    <string name="spoken_accented_letter_00B5" msgid="9031387673828823891">"Micro 符號"</string>
+    <string name="spoken_accented_letter_00BA" msgid="5045198452071207437">"雄性符號"</string>
+    <string name="spoken_accented_letter_00DF" msgid="2260098367028134281">"清音 S"</string>
+    <string name="spoken_accented_letter_00E0" msgid="2234515772182387086">"抑音符 A"</string>
+    <string name="spoken_accented_letter_00E1" msgid="7780174500802535063">"銳音符 A"</string>
+    <string name="spoken_accented_letter_00E2" msgid="7054108480488102631">"揚抑符 A"</string>
+    <string name="spoken_accented_letter_00E3" msgid="8252569677935693343">"顎化符 A"</string>
+    <string name="spoken_accented_letter_00E4" msgid="6610118430986969466">"分音符 A"</string>
+    <string name="spoken_accented_letter_00E5" msgid="7630449270070348394">"帶上圓圈的 A"</string>
+    <string name="spoken_accented_letter_00E6" msgid="701838036007000032">"連字 AE"</string>
+    <string name="spoken_accented_letter_00E7" msgid="2991289211702135310">"下加符 C"</string>
+    <string name="spoken_accented_letter_00E8" msgid="2080035251848179782">"抑音符 E"</string>
+    <string name="spoken_accented_letter_00E9" msgid="2708473976407506968">"銳音符 E"</string>
+    <string name="spoken_accented_letter_00EA" msgid="1898848081635119449">"揚抑符 E"</string>
+    <string name="spoken_accented_letter_00EB" msgid="8318942663983499634">"分音符 E"</string>
+    <string name="spoken_accented_letter_00EC" msgid="7643810590358306098">"抑音符 I"</string>
+    <string name="spoken_accented_letter_00ED" msgid="8288035355103120759">"銳音符 I"</string>
+    <string name="spoken_accented_letter_00EE" msgid="1137417730211688894">"揚抑符 I"</string>
+    <string name="spoken_accented_letter_00EF" msgid="8993714322731956785">"分音符 I"</string>
+    <string name="spoken_accented_letter_00F0" msgid="3427567511221967857">"濁齒擦音符號"</string>
+    <string name="spoken_accented_letter_00F1" msgid="6983294908255378605">"顎化符 N"</string>
+    <string name="spoken_accented_letter_00F2" msgid="2623804069332183695">"抑音符 O"</string>
+    <string name="spoken_accented_letter_00F3" msgid="8945987631729216917">"銳音符 O"</string>
+    <string name="spoken_accented_letter_00F4" msgid="2415494299699717276">"揚抑符 O"</string>
+    <string name="spoken_accented_letter_00F5" msgid="7320512716652765243">"顎化符 O"</string>
+    <string name="spoken_accented_letter_00F6" msgid="9101179351242478555">"分音符 O"</string>
+    <string name="spoken_accented_letter_00F8" msgid="1488324280918884122">"帶斜線的 O"</string>
+    <string name="spoken_accented_letter_00F9" msgid="2823570256527173278">"抑音符 U"</string>
+    <string name="spoken_accented_letter_00FA" msgid="6883092085077298608">"銳音符 U"</string>
+    <string name="spoken_accented_letter_00FB" msgid="4948239400399514418">"揚抑符 U"</string>
+    <string name="spoken_accented_letter_00FC" msgid="2496066211694000442">"分音符 U"</string>
+    <string name="spoken_accented_letter_00FD" msgid="2400529610834233890">"銳音符 Y"</string>
+    <string name="spoken_accented_letter_00FE" msgid="8788160115017853040">"刺形符號"</string>
+    <string name="spoken_accented_letter_00FF" msgid="5225610161025124830">"分音符 Y"</string>
+    <string name="spoken_accented_letter_0101" msgid="5573209280917268157">"長音符 A"</string>
+    <string name="spoken_accented_letter_0103" msgid="2469151120095164730">"短音符 A"</string>
+    <string name="spoken_accented_letter_0105" msgid="8312689789855786427">"反下加符 A"</string>
+    <string name="spoken_accented_letter_0107" msgid="5708507895287798642">"銳音符 C"</string>
+    <string name="spoken_accented_letter_0109" msgid="7008112603489583335">"揚抑符 C"</string>
+    <string name="spoken_accented_letter_010B" msgid="5641359473019753216">"上點 C"</string>
+    <string name="spoken_accented_letter_010D" msgid="1048661826408437168">"倒折音符 C"</string>
+    <string name="spoken_accented_letter_010F" msgid="603374318657992205">"倒折音符 D"</string>
+    <string name="spoken_accented_letter_0111" msgid="5517997642285938260">"帶斜線的 D"</string>
+    <string name="spoken_accented_letter_0113" msgid="2326009009311798997">"長音符 E"</string>
+    <string name="spoken_accented_letter_0115" msgid="3964545407091037747">"短音符 E"</string>
+    <string name="spoken_accented_letter_0117" msgid="8799753183781089777">"上點 E"</string>
+    <string name="spoken_accented_letter_0119" msgid="3772451226935709136">"反下加符 E"</string>
+    <string name="spoken_accented_letter_011B" msgid="7663481332351461288">"倒折音符 E"</string>
+    <string name="spoken_accented_letter_011D" msgid="1181326600595482369">"揚抑符 G"</string>
+    <string name="spoken_accented_letter_011F" msgid="6843415389823096647">"短音符 G"</string>
+    <string name="spoken_accented_letter_0121" msgid="6205288708713306903">"上點 G"</string>
+    <string name="spoken_accented_letter_0123" msgid="2394277128105386261">"下加符 G"</string>
+    <string name="spoken_accented_letter_0125" msgid="6575866461277751345">"揚抑符 H"</string>
+    <string name="spoken_accented_letter_0127" msgid="1316971762214091641">"帶斜線的 H"</string>
+    <string name="spoken_accented_letter_0129" msgid="7824912405885325754">"顎化符 I"</string>
+    <string name="spoken_accented_letter_012B" msgid="6772690258769905270">"長音符 I"</string>
+    <string name="spoken_accented_letter_012D" msgid="2933871131556503448">"短音符 I"</string>
+    <string name="spoken_accented_letter_012F" msgid="1340511254985181663">"反下加符 I"</string>
+    <string name="spoken_accented_letter_0131" msgid="5635600720566083969">"無點 I"</string>
+    <string name="spoken_accented_letter_0133" msgid="7593704176516791941">"連字 IJ"</string>
+    <string name="spoken_accented_letter_0135" msgid="4521109674238248436">"揚抑符 J"</string>
+    <string name="spoken_accented_letter_0137" msgid="5886444641003852175">"下加符 K"</string>
+    <string name="spoken_accented_letter_0138" msgid="4200294389170924853">"Kra 符號"</string>
+    <string name="spoken_accented_letter_013A" msgid="3558015385412543517">"銳音符 L"</string>
+    <string name="spoken_accented_letter_013C" msgid="1853639924813858734">"下加符 L"</string>
+    <string name="spoken_accented_letter_013E" msgid="7489345561739421886">"倒折音符 L"</string>
+    <string name="spoken_accented_letter_0140" msgid="7946718707268270589">"中點 L"</string>
+    <string name="spoken_accented_letter_0142" msgid="752931798111122240">"帶斜線的 L"</string>
+    <string name="spoken_accented_letter_0144" msgid="201843550323875352">"銳音符 N"</string>
+    <string name="spoken_accented_letter_0146" msgid="3403847152606051818">"下加符 N"</string>
+    <string name="spoken_accented_letter_0148" msgid="9215300786722209338">"倒折音符 N"</string>
+    <string name="spoken_accented_letter_0149" msgid="3191850286630154063">"前接單引號的 N"</string>
+    <string name="spoken_accented_letter_014B" msgid="8503022408522837410">"軟顎鼻音"</string>
+    <string name="spoken_accented_letter_014D" msgid="4452323602550610641">"長音符 O"</string>
+    <string name="spoken_accented_letter_014F" msgid="2795957717094385336">"短音符 O"</string>
+    <string name="spoken_accented_letter_0151" msgid="8013704745216410244">"雙銳音符 O"</string>
+    <string name="spoken_accented_letter_0153" msgid="8410582495993285221">"連字 OE"</string>
+    <string name="spoken_accented_letter_0155" msgid="7601517174689798560">"銳音符 R"</string>
+    <string name="spoken_accented_letter_0157" msgid="9071455715455643810">"下加符 R"</string>
+    <string name="spoken_accented_letter_0159" msgid="7726911392381543439">"倒折音符 R"</string>
+    <string name="spoken_accented_letter_015B" msgid="1854129531164494117">"銳音符 S"</string>
+    <string name="spoken_accented_letter_015D" msgid="4743571603550582530">"揚抑符 S"</string>
+    <string name="spoken_accented_letter_015F" msgid="1519945638631588761">"下加符 S"</string>
+    <string name="spoken_accented_letter_0161" msgid="7493478552029144246">"倒折音符 S"</string>
+    <string name="spoken_accented_letter_0163" msgid="9103547637928833069">"下加符 T"</string>
+    <string name="spoken_accented_letter_0165" msgid="7306159398214872062">"倒折音符 T"</string>
+    <string name="spoken_accented_letter_0167" msgid="5578767705098672443">"帶斜線的 T"</string>
+    <string name="spoken_accented_letter_0169" msgid="413046581387735371">"顎化符 U"</string>
+    <string name="spoken_accented_letter_016B" msgid="3209778874978859441">"長音符 U"</string>
+    <string name="spoken_accented_letter_016D" msgid="2983326533258602840">"短音符 U"</string>
+    <string name="spoken_accented_letter_016F" msgid="4416532499516387231">"帶上圓圈的 U"</string>
+    <string name="spoken_accented_letter_0171" msgid="3435171971353200807">"雙銳音符 U"</string>
+    <string name="spoken_accented_letter_0173" msgid="4494154432483553480">"反下加符 U"</string>
+    <string name="spoken_accented_letter_0175" msgid="2154545579611918513">"揚抑符 W"</string>
+    <string name="spoken_accented_letter_0177" msgid="4034463827306904781">"揚抑符 Y"</string>
+    <string name="spoken_accented_letter_017A" msgid="3368292232292925369">"銳音符 Z"</string>
+    <string name="spoken_accented_letter_017C" msgid="2834484584505860430">"上點 Z"</string>
+    <string name="spoken_accented_letter_017E" msgid="1209240442434887098">"倒折音符 Z"</string>
+    <string name="spoken_accented_letter_017F" msgid="317501463253362415">"長音 S"</string>
+    <string name="spoken_accented_letter_01A1" msgid="630186564859044196">"帶觸角的 O"</string>
+    <string name="spoken_accented_letter_01B0" msgid="8544012177684640443">"帶觸角的 U"</string>
+    <string name="spoken_accented_letter_0219" msgid="1960371842020076066">"下加逗號的 S"</string>
+    <string name="spoken_accented_letter_021B" msgid="1398418662032919032">"下加逗號的 T"</string>
+    <string name="spoken_accented_letter_0259" msgid="2464085263158415898">"中性母音符號"</string>
+    <string name="spoken_accented_letter_1EA1" msgid="688124877202887630">"下點 A"</string>
+    <string name="spoken_accented_letter_1EA3" msgid="327960130366386256">"上方加勾的 A"</string>
+    <string name="spoken_accented_letter_1EA5" msgid="637406363453769610">"帶揚抑符和銳音符的 A"</string>
+    <string name="spoken_accented_letter_1EA7" msgid="1419591804181615409">"帶揚抑符和抑音符的 A"</string>
+    <string name="spoken_accented_letter_1EA9" msgid="6068887382734896756">"帶揚抑符和上勾的 A"</string>
+    <string name="spoken_accented_letter_1EAB" msgid="7236523151662538333">"帶揚抑符和顎化符的 A"</string>
+    <string name="spoken_accented_letter_1EAD" msgid="2363364864106332076">"帶揚抑符和下點的 A"</string>
+    <string name="spoken_accented_letter_1EAF" msgid="1576329511464272935">"帶短音符和銳音符的 A"</string>
+    <string name="spoken_accented_letter_1EB1" msgid="4634735072816076592">"帶短音符和抑音符的 A"</string>
+    <string name="spoken_accented_letter_1EB3" msgid="2325245849038771534">"帶短音符和上勾的 A"</string>
+    <string name="spoken_accented_letter_1EB5" msgid="3720427596242746295">"帶短音符和顎化符的 A"</string>
+    <string name="spoken_accented_letter_1EB7" msgid="700415535653646695">"帶短音符和下點的 A"</string>
+    <string name="spoken_accented_letter_1EB9" msgid="3901338692305890487">"下點 E"</string>
+    <string name="spoken_accented_letter_1EBB" msgid="4028688699415417302">"上方加勾的 E"</string>
+    <string name="spoken_accented_letter_1EBD" msgid="181253633045931897">"顎化符 E"</string>
+    <string name="spoken_accented_letter_1EBF" msgid="3309618845007944963">"帶揚抑符和銳音符的 E"</string>
+    <string name="spoken_accented_letter_1EC1" msgid="8139046749226332542">"帶揚抑符和抑音符的 E"</string>
+    <string name="spoken_accented_letter_1EC3" msgid="3239674223053133383">"帶揚抑符和上勾的 E"</string>
+    <string name="spoken_accented_letter_1EC5" msgid="2216559244705714587">"帶揚抑符和顎化符的 E"</string>
+    <string name="spoken_accented_letter_1EC7" msgid="9012731468253986792">"帶揚抑符和下點的 E"</string>
+    <string name="spoken_accented_letter_1EC9" msgid="2901917620195717034">"上方加勾的 I"</string>
+    <string name="spoken_accented_letter_1ECB" msgid="5470387489820034621">"下點 I"</string>
+    <string name="spoken_accented_letter_1ECD" msgid="1340122876914839806">"下點 O"</string>
+    <string name="spoken_accented_letter_1ECF" msgid="2326921263882559755">"上方加勾的 O"</string>
+    <string name="spoken_accented_letter_1ED1" msgid="2885683296042774958">"帶揚抑符和銳音符的 O"</string>
+    <string name="spoken_accented_letter_1ED3" msgid="6857664926477376178">"帶揚抑符和抑音符的 O"</string>
+    <string name="spoken_accented_letter_1ED5" msgid="2015209467290624062">"帶揚抑符和上勾的 O"</string>
+    <string name="spoken_accented_letter_1ED7" msgid="7924481354960306389">"帶揚抑符和顎化符的 O"</string>
+    <string name="spoken_accented_letter_1ED9" msgid="7023315590332365554">"帶揚抑符和下點的 O"</string>
+    <string name="spoken_accented_letter_1EDB" msgid="2379438944917634496">"帶觸角和銳音符的 O"</string>
+    <string name="spoken_accented_letter_1EDD" msgid="8107077534204404085">"帶觸角和抑音符的 O"</string>
+    <string name="spoken_accented_letter_1EDF" msgid="1846880105528347966">"帶觸角和上勾的 O"</string>
+    <string name="spoken_accented_letter_1EE1" msgid="1520037313389776718">"帶觸角和顎化符的 O"</string>
+    <string name="spoken_accented_letter_1EE3" msgid="907964027171008963">"帶觸角和下點的 O"</string>
+    <string name="spoken_accented_letter_1EE5" msgid="1522024630360038700">"下點 U"</string>
+    <string name="spoken_accented_letter_1EE7" msgid="7815412228302952637">"上方加勾的 U"</string>
+    <string name="spoken_accented_letter_1EE9" msgid="4219119671251485651">"帶觸角和銳音符的 U"</string>
+    <string name="spoken_accented_letter_1EEB" msgid="4086009841269002231">"帶觸角和抑音符的 U"</string>
+    <string name="spoken_accented_letter_1EED" msgid="3528151733528719847">"帶觸角和上勾的 U"</string>
+    <string name="spoken_accented_letter_1EEF" msgid="3508548229409072119">"帶觸角和顎化符的 U"</string>
+    <string name="spoken_accented_letter_1EF1" msgid="1912816350401931115">"帶觸角和下點的 U"</string>
+    <string name="spoken_accented_letter_1EF3" msgid="7211760439435946494">"抑音符 Y"</string>
+    <string name="spoken_accented_letter_1EF5" msgid="8998864482764007384">"下點 Y"</string>
+    <string name="spoken_accented_letter_1EF7" msgid="922043627252869200">"上方加勾的 Y"</string>
+    <string name="spoken_accented_letter_1EF9" msgid="6213977100552260366">"顎化符 Y"</string>
+    <string name="spoken_symbol_00A1" msgid="4281758332905123408">"倒置的驚嘆號"</string>
+    <string name="spoken_symbol_00AB" msgid="4093069643313064892">"左雙角括號"</string>
+    <string name="spoken_symbol_00B7" msgid="2447718728927874920">"中間點"</string>
+    <string name="spoken_symbol_00B9" msgid="8026257165451461231">"上標字 1"</string>
+    <string name="spoken_symbol_00BB" msgid="1102740075655373928">"右雙角括號"</string>
+    <string name="spoken_symbol_00BF" msgid="6233794752573788098">"倒置的問號"</string>
+    <string name="spoken_symbol_2018" msgid="4886476295598930225">"左單引號"</string>
+    <string name="spoken_symbol_2019" msgid="8892530161598134083">"右單引號"</string>
+    <string name="spoken_symbol_201A" msgid="2072987157683446644">"Low-9 單引號"</string>
+    <string name="spoken_symbol_201C" msgid="4588048378803665427">"左雙引號"</string>
+    <string name="spoken_symbol_201D" msgid="1642776849495925895">"右雙引號"</string>
+    <string name="spoken_symbol_2020" msgid="9084628638189344431">"單劍註釋符號"</string>
+    <string name="spoken_symbol_2021" msgid="5081396468559426475">"雙劍註釋符號"</string>
+    <string name="spoken_symbol_2030" msgid="9068837172419431755">"千分比符號"</string>
+    <string name="spoken_symbol_2032" msgid="3014506329156664396">"角分符號"</string>
+    <string name="spoken_symbol_2033" msgid="1251022699713475088">"角秒符號"</string>
+    <string name="spoken_symbol_2039" msgid="6989616457213775957">"左英文單引號"</string>
+    <string name="spoken_symbol_203A" msgid="31245095449823701">"右英文單引號"</string>
+    <string name="spoken_symbol_2074" msgid="2116717717093306894">"上標 4"</string>
+    <string name="spoken_symbol_207F" msgid="1706731172134246659">"上標小寫拉丁字母 N"</string>
+    <string name="spoken_symbol_20B1" msgid="2159994270622444689">"披索符號"</string>
+    <string name="spoken_symbol_2105" msgid="7289404939366976829">"轉交符號"</string>
+    <string name="spoken_symbol_2192" msgid="827804523596125414">"向右箭頭"</string>
+    <string name="spoken_symbol_2193" msgid="2659541693445985717">"向下箭頭"</string>
+    <string name="spoken_symbol_2205" msgid="4457188084269117343">"空集合"</string>
+    <string name="spoken_symbol_2206" msgid="4856786565708380687">"遞增"</string>
+    <string name="spoken_symbol_2264" msgid="5092061257745123554">"小於或等於"</string>
+    <string name="spoken_symbol_2265" msgid="1907966479878036357">"大於或等於"</string>
+    <string name="spoken_symbol_2605" msgid="5202920479405857753">"黑星"</string>
+</resources>