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1000-hours/sounds-of-american-english/2.1.2-tongue.md

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 Fortunately, when practicing American pronunciation, there's only one situation where we need to actively control and practice the position of the vocal cords - the r-colored vowel sound in <span class="pho">ə</span> (represented as <span class="pho">ɚ</span> and <span class="pho">ɝː</span>). Please refer to section [2.1.5](2.1.5-ə) for more information.
 
+另外，iOS 上有一个 APP，[The Phonetics 3D](https://apps.apple.com/us/app/the-phonetics-3d/id841485989)，一个日本人做的软件，$7.99 的价格，可以看到每个单词朗读时口腔内部的活动情况，很是实用：
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+Additionally, there's an app on iOS called [The Phonetics 3D](https://apps.apple.com/us/app/the-phonetics-3d/id841485989), created by a Japanese developer, priced at $7.99, and it allows you to see the movements inside the mouth when pronouncing each word, being extremely helpful.
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 [^1]: Figure adapted from *FUNDAMENTALS OF PHONETICS: a practical guide for students* 5th Edition, by Larry H. Small, 2019. Page 55
 [^2]: https://www.youtube.com/watch?v=wYwk07QM4rc