We do that when the sound before is unvoiced.

当其前面为时，我们会这样做。

And a 'th' at the end of a word is usually unvoiced.

单词末尾“th”一般也都是辅。

So the 'th' at the start of content words is usually unvoiced.

所以实义词之前“th”一般都是辅。

It's unvoiced because there's no vibration here.

它是无声，因为这里没有振动。

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

如果第一个辅是，无论怎样，第二个也会是。

Now if there is a 'th' in the middle of a word, before a consonant, it's usually unvoiced.

如果在单词中间、辅之前有一个“th”话，通常都是辅。

They have the same tongue and mouth position but one uses air to make the sound, it's unvoiced.

它们舌头和嘴位置是一样，但其中一个是。

The first one is voiced, the second one is unvoiced.

第一个是浊，第二个是。

If you look it up in IPA, thank has unvoiced TH, AA as in Bat, NG sound, K.

如果你在 IPA 中查找它， thank 有 TH，AA 在 Bat 中， NG 声， K。

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，之前声是，所以 ed 结尾为 T。

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

对于那些对这类事情感兴趣人来说， “s” 在名词形式中是。

The ED ending is a T when the sound before is unvoiced. The K is unvoiced, so the ED ending here is a T.

当前面声是时，ED 结尾是 T。 K 是，所以这里结尾 ED 是 T。

S and Z are a pair, they go together because they have the same mouth position, and S is unvoiced, and that's considered strong.

S 和 Z 是一组辅，它们是一组是因为它们位置是一样，S 是，而且是一个强。

Now, if the last sound of the base form of the verb is unvoiced, then that means that there's no vibration or almost no vibration, alright, when you say it.

现在，如果动词基本形式最后一个是，那就意味着没有振动或几乎没有振动， 好吧，当你说它时候。

So, if the sound before the letter T and the word to is unvoiced like here, S is an unvoiced sound S, then the T will probably be a true T.

所以，如果字母 T 之前声和单词像这里一样是，S 是 S，那么 T 很可能是真正 T。