We do that when the sound before is unvoiced.

当为不发时，我们会这样做。

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

单词末尾“th”般也都是清。

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

所以实义词之“th”般都是清。

Mainly as a girl, I learned, as a girl, that anger is an emotion better left entirely unvoiced.

主要是作为个女孩，我了解到， 作为个女孩，愤怒是种情感，最好将它置之不顾。

There's the voiced TH and the unvoiced TH.

有浊 TH 和清 TH。

Unvoiced consonant sounds are made by air pushing through your mouth.

清是空气通过你嘴巴进行发。

An unvoiced consonant is one where there's no vibration here.

不发是指这里没有振动。

These sentences have both the voiced and unvoiced TH.

这些句子包含 TH 两个发。

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

这发生在过去式中动词以清结尾情况。

The voiced TH sound is almost exactly the same as the unvoiced TH sound.

浊 TH 和轻 TH 几乎完全样。

This is called the unvoiced TH sound.

这被称为不发 TH 。

So a 'th' at the beginning of content words is usually an unvoiced 'th' sound.

在实义词“th”通常都是清。

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

正如我之所说，“th”有两种发，种是浊，种是清。

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

它是无声，因为这里没有振动。

With an unvoiced TH, the tongue tip does have to come through the teeth for this. Method.

对于无声 TH 来说，舌尖必须穿过牙齿才能做到这点。

So this is the unvoiced 'th' sound.

这就是清“th”。

Now this 'dith' end in an unvoiced th sound, tongue tip 'dith' come through the teeth for that, 'Meredith'.

现在这个 dith 以不发 th 结尾，发时舌尖从牙齿中间露出来，Meredith。

So that is an unvoiced sound.

所以那是个清。

So when should you use the voiced or the unvoiced sound?

那什么时候该使用清，什么时候该使用浊呢？

It's got that unvoiced TH at the beginning.

开始就是清。