It happens in the past tense when verbs end with an unvoiced sound.

生在过去式中动词以清音结尾的情况。

Now when the -ed suffix appears after a voiceless consonant.

现在我们来看看“ed”缀出现在一个清音辅音的情况。

Now look, I am not expecting you to start analyzing your consonants whether they're voiced or voiceless in the middle of a conversation.

我不指望你们在对话中开始分析辅音，不管它们是音的还是清音的。

Now we have an ed ending, the sound before is unvoiced so that ed ending is pronounced as a T.

现在我们有一个 ed 结尾，前的声音是清音的，所以 ed 结尾音为 T。

The " s" is unvoiced in the noun form, for those of you who are interested in that sort of thing.

对于那些对类事情感兴趣的人来说， “s” 在名词形式中是清音的。

Here, it comes between S, it comes between the unvoiced TH in 'thing' and he drops the T. That helps him link those two words.

在里，它位于 S 间，位于“thing” 中的清音 TH 间， 他去掉了 T。 有助于他将两个词联系起来。

Now, I've made some videos about voiced and voiceless consonant sounds, so you can click on this link and it'll take you to those and show you the difference.

现在，我已经做了一些关于浊音和清音辅音的视频，你可以点击个链接，它会带你去看它们的区别。