diff --git a/1000-hours/sounds-of-american-english/2.1.1-lips.md b/1000-hours/sounds-of-american-english/2.1.1-lips.md
index ce28a9a2..a8af8d7b 100644
--- a/1000-hours/sounds-of-american-english/2.1.1-lips.md
+++ b/1000-hours/sounds-of-american-english/2.1.1-lips.md
@@ -4,7 +4,11 @@
 
 Human speech, at its core, is universal - the clearest example being that all languages share certain fundamental tenets. Every language places vowels at their heart and maintains a similar basic vowel phonemes such as `ɑ`, `i`, `ʊ`, `e`, `ɔ`, amongst others. Take Japanese for instance; it uses precisely these five vowels only. English includes one more: `ə`. Korean even outpaces English by adding another one —`ɤ`<span class="speak-word-inline" data-audio-other="/audios/us/Close-mid_back_unrounded_vowel.ogg.mp3"></span> (represented in Hangul as `ᅳ`). Interestingly enough you can find this sound in Mandarin Chinese too — like in `sī` of "思念" `sīniàn`, meaning to miss or remember.
 
-元音发声时，气流从肺部通过声门冲击**声带**，使其均匀震动，而后通过起着共鸣器作用的口腔，无阻力地呼出。
+虽然英文的音标列表里并没有收录 `ɤ` 这个音，可实际上，你试试就知道了：`d` 被读作 `dɤ`，`g` 被读作 `gɤ` —— 其中的 `ɤ` 很轻很短；同样，`t` 实际上被读作 `tɤ`，`k` 被读作 `kɤ` —— 其中的 `ɤ` 没有气流振动。
+
+Even though the phonetic symbol `ɤ` isn't included in English phonetic chart, you'll notice something interesting if you try it out: the letter `d` is actually pronounced as `dɤ`, and `g` is pronounced as `gɤ`. Here, the `ɤ` sound is very light and brief. Similarly, `t` is actually pronounced as `tɤ`, and `k` is pronounced as `kɤ`, with the `ɤ` not involving any airflow vibration.
+
+元音发声时，气流从肺部通过声门冲击**声带**，使其均匀振动，而后通过起着共鸣器作用的口腔，无阻力地呼出。
 
 For vowel pronunciation, the airflow from your lungs strikes against your *vocal cords* through the glottis. This produces a consistent vibration that is amplified as it travels unimpeded through your mouth - the resonator cavity - before being expelled freely.