Which is more difficult, breathing in or breathing out?

是吸气困难还是呼气困难？

What's harder, breathing in or breathing out?

是吸气困难不是呼气困难？

And that spared people from breathing them in.

避免民众吸入这些污染物。

An issue of breathing in air.

事关呼吸。

Breathing, in other words, keeps the body alive.

呼吸，使人活着。

It begins with you breathing in, and drawing air into them.

它是从你吸入空气而开始的。

I've been breathing dust in my lungs for 20 years.

我的肺已经吸了20年尘土了。

It's not the kind of stuff you wanna be breathing in.

这个你不能吸入体内的。

In rare cases, people can become infected by breathing in the virus.

在极少数情况下，人们会因吸入病毒而感染。

While they are laughing, they concentrate on breathing in a particular way.

当他们笑的时候，他们以一种特殊的方式专注于呼吸。

American English has some expressions that use breath or breathing in them.

美式英语中有一些使用" breath" 或" breathing" 的表达。

You do not want to risk breathing in what is blowing around.

你可不想冒着吸入扬尘的风险。

Every time you breathe in, you're breathing in the natural world.

你的每一次呼吸，都是在自然世界中呼吸。

Still breathing in great leaky gulps, I am lifted out of the helicopter.

我仍然大口漏气地呼吸着，被人从直升飞机上抬下来。

Repeatedly, the animal is clearly shown breathing in smoke, then blowing it out.

大猩猩反复并清晰地展示了如何“吞云吐雾”。

He tilted his small head back, breathing in the fragrance. His stomach moaned.

他扬起了小脑袋，闻着传来的香味。他的肚子在咕噜咕噜地叫。

Inhaling, or breathing in, smoke can affect tens of millions of people each year.

每年，吸入烟雾可能会影响数千万人。

There are even studies showing a link between mouth breathing in adolescence and decreased IQ.

有研究表明，青春期经常用嘴呼吸与低智商有关。

Now, now in addition to air, you're constantly breathing in other stuff, like microbes.

然而，除了空气，你还在不停地呼吸其他东西，比如微生物。

I laid my head cautiously against his shoulder, breathing in the smell of his skin.

我小心地把头靠在他的肩膀上，细嗅着他肌肤上的芳香。