diff --git a/1000-hours/sounds-of-american-english/2.4.3-cc.md b/1000-hours/sounds-of-american-english/2.4.3-cc.md
index 93506d8f..75b315f8 100644
--- a/1000-hours/sounds-of-american-english/2.4.3-cc.md
+++ b/1000-hours/sounds-of-american-english/2.4.3-cc.md
@@ -76,7 +76,7 @@ For example, take the sentence *Was he hurt?* If pronounced separately, it shoul
Many Americans have a unique habit with the t sound, especially when it follows n. Their way of speaking often causes the t to disappear. For instance, when they say the word *interview*, you might hear ˈɪnəˌvju, without the t.
-另外，ð 也可能被击穿，基本只发生在 *them* 这个常用词上。比如，*let them* let ðəm, 变成了 let-əm，由由于 ð 被击穿了之后，t 等于被夹在了两个元音之间，于是会变成浊化的弹舌音 t̬，于是，说出来的或者听到的是 let̬əm…… 所以，在快速的自然语流中 *let him* 和 *let them* 实际上几乎没有区别，需要通过上下文确定究竟是 *him* 还是 *them*。
+另外，ð 也可能被击穿，基本只发生在 *them* 这个常用词上。比如，*let them* let ðəm, 变成了 let-əm，又由于 ð 被击穿了之后，t 等于被夹在了两个元音之间，于是会变成浊化的弹舌音 t̬，于是，说出来的或者听到的是 let̬əm…… 所以，在快速的自然语流中 *let him* 和 *let them* 实际上几乎没有区别，需要通过上下文确定究竟是 *him* 还是 *them*。
In addition, the ð sound can also be dropped, primarily in the common word *them*. For example, *let them* let ðəm might become let-əm. When the ð is dropped, the t ends up sandwiched between two vowels and turns into the voiced flap t̬. So, what you say or hear becomes let̬əm. Therefore, in fast natural speech, *let him* and *let them* sound almost identical and only context can determine whether it's *him* or *them*.