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ZuodaoTech · Feb 23, 2024 · 59599b6 · 59599b6
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diff --git a/1000-hours/public/images/speech-tract-lr.dark.svg b/1000-hours/public/images/speech-tract-lr.dark.svg
diff --git a/1000-hours/public/images/speech-tract-lr.light.svg b/1000-hours/public/images/speech-tract-lr.light.svg
diff --git a/1000-hours/public/images/speech-tract-r.dark.svg b/1000-hours/public/images/speech-tract-r.dark.svg
diff --git a/1000-hours/public/images/speech-tract-r.light.svg b/1000-hours/public/images/speech-tract-r.light.svg
diff --git a/1000-hours/public/images/speech-tract-tdsz.dark.svg b/1000-hours/public/images/speech-tract-tdsz.dark.svg
diff --git a/1000-hours/public/images/speech-tract-tdsz.light.svg b/1000-hours/public/images/speech-tract-tdsz.light.svg
diff --git a/1000-hours/public/images/speech-tract-θð.dark.svg b/1000-hours/public/images/speech-tract-θð.dark.svg
diff --git a/1000-hours/public/images/speech-tract-θð.light.svg b/1000-hours/public/images/speech-tract-θð.light.svg
diff --git a/1000-hours/sounds-of-english/16-tdsz.md b/1000-hours/sounds-of-english/16-tdsz.md
@@ -4,7 +4,7 @@
 
 `t, d, s, z` 这 4 个辅音的发声关键，在于它们发声时起始的**舌尖位置**。
 
-![](/images/speech-tract-tdsz.svg)
+<img src="/images/speech-tract-tdsz.svg" class="themed" />
 
 在中文普通话里，`t, d` 这两个声母发声时起始的**舌尖位置** 贴在牙齿上；`s, z` 这两个声母发声时起始的 “舌尖位置” 接近牙齿，但留了个空隙以便气流通过。你可以试着用中文普通话说一遍 “我踢死你”（`wǒ tī sǐ nǐ`<span class="speak-word-inline" data-audio-uk="/audios/我踢死你-zh-cn-male.mp3"></span>）。
 

diff --git a/1000-hours/sounds-of-english/21-θð.md b/1000-hours/sounds-of-english/21-θð.md
@@ -2,7 +2,7 @@
 
 `θ, ð` 这两个辅音，学校里常见教材一般都强调说**一定要把舌尖夹在齿间**再开始发音。其实不一定要那么严格，实际上，舌尖即便没有伸出到齿外也可以，大多数时候，只要舌尖贴到上齿之后开始发音就可以了。
 
-![](/images/speech-tract-θð.svg)
+<img src="/images/speech-tract-θð.svg" class="themed" />
 
 
 

diff --git a/1000-hours/sounds-of-english/22-r.md b/1000-hours/sounds-of-english/22-r.md
@@ -2,7 +2,7 @@
 
 `r` 这个辅音原本不难，但，美式英语有个独特之处造成了困难。它的难度并不在于发音起始的 “舌尖位置”，而是 “舌尖姿势”。英式英语中，`r` 只有一种 “舌尖姿势”，舌尖向前贴在上颚；可在美式英语中，*rock* `r/ɔk/`<span class="speak-word-inline" data-audio-us="/audios/rock-us.mp3"></span> 是舌尖向前的，但，*card* `/kɑːʳd/`<span class="speak-word-inline" data-audio-us="/audios/card-us.mp3"></span> 的舌尖姿势却是后卷的。
 
-![](/images/speech-tract-r.svg)
+<img src="/images/speech-tract-r.svg" class="themed" />
 
 
 

diff --git a/1000-hours/sounds-of-english/23-l.md b/1000-hours/sounds-of-english/23-l.md
@@ -10,6 +10,4 @@
 
 所以，要格外注意 `l` 在元音之后的情况，注意舌尖位置正确，动作完整，不能有嘴唇动作 —— 否则就会出现 `ʊ` 音。
 
-![](/images/speech-tract-l.svg)
-
-<img src="/images/speech-tract-l.svg" class="themed"/>
+<img src="/images/speech-tract-l.svg" class="themed" />
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		`θ, ð` 这两个辅音，学校里常见教材一般都强调说一定要把舌尖夹在齿间再开始发音。其实不一定要那么严格，实际上，舌尖即便没有伸出到齿外也可以，大多数时候，只要舌尖贴到上齿之后开始发音就可以了。

		![](/images/speech-tract-θð.svg)
		<img src="/images/speech-tract-θð.svg" class="themed" />



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Original file line number	Diff line number	Diff line change
Expand Up		@@ -2,7 +2,7 @@

		`r` 这个辅音原本不难，但，美式英语有个独特之处造成了困难。它的难度并不在于发音起始的 “舌尖位置”，而是 “舌尖姿势”。英式英语中，`r` 只有一种 “舌尖姿势”，舌尖向前贴在上颚；可在美式英语中，rock `r/ɔk/`<span class="speak-word-inline" data-audio-us="/audios/rock-us.mp3"></span> 是舌尖向前的，但，card `/kɑːʳd/`<span class="speak-word-inline" data-audio-us="/audios/card-us.mp3"></span> 的舌尖姿势却是后卷的。

		![](/images/speech-tract-r.svg)
		<img src="/images/speech-tract-r.svg" class="themed" />



Expand Down