When the word ends with a voiceless consonant, then we add an S.

当单词以清音音结尾时，我们的音是/s/。

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

生在过去中动词以清音结尾的情况。

So, if we compare a word like 'pat' and 'bat' (so 'p' at the beginning of 'pat' is voiceless and 'b' at the beginning of 'bat' which is voiced).

我们来比较 pat 和 bat（pat 开头的 p 是清音，bat 开头的 b 是浊音）。

He invoked the word in the 1950s mostly in homage to linguists like Roman Jakobson, who had posited binary opposites (voiced and voiceless elements) as the building blocks of language.

他在1950年代使用词的时候，主要是为了向罗曼·雅各布森（认为语言是由清音和浊音两种二元对立的元素所构成）样的语言学家致敬。

So the unvoiced TH, of course, is when we do not make a sound with our vocal cords.

当然，清音 TH 是指我们不用声带出声音。

If the first one is unvoiced, the second one will sou nd unvoiced, no matter what you do.

如果第音是清音，无论怎样，第二也会是清音。

So that is an unvoiced sound.

所以那是清音。

But some sounds are not voiced.

但是有些因素是不用出声音的——清音。

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，我已经做了些关于浊音和清音音的视频，你可以点击链接，它会带你去看它们的区别。

So here's the thing, English doesn't like it when there are two consonants one after the other when one is voiceless and the other one is voiced.

事情是样的，英语不喜欢有两音连在起，是清音，是浊音。

So let's go straight into it and talk about the differences between the unvoiced and the voiced.

那我们就直奔主题，来谈谈清音和浊音的区别。

A voiced consonant at the end of a word will be slightly unvoiced.

单词末尾的浊音会稍微清音。

Now as I mentioned, there are two 'th' sounds, a voiced sound and an unvoiced sound.

正如我之前所说，“th”有两种音，种是浊音，种是清音。

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

现在我们来看看“ed”后缀出现在清音音之后的情况。

But first, let's try some sentences with both the voiced and the unvoiced.

但是首先，让我们尝试些带有浊音和清音的句子。

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音，不管它们是音的还是清音的。

There's the voiced TH and the unvoiced TH.

有浊音 TH 和清音 TH。

Practice going from unvoiced to voiced and back if you want.

如果你愿意，可以练习从清音到浊音再重复。

So when the -ed suffix appears after a voiceless consonant, then it turns into a 't.'

所以，当“ed”后缀出现在清音音之后，它就变成了“t”音。

Either two voiceless consonants or two voiced consonants.

两清音或两浊音。