Humans take in oxygen and breathe out carbon dioxide.

人吸入氧气，呼出二氧化碳。

《牛津词典》

In smoggy weather, the machine would breathe in the air in front of the bike and blow out a stream of clean air toward the biker's face.

在有雾霾的天气里，机器会吸进自行车前面的空气，然后向骑自行车的人的脸上吹出一股清新的空气。

youdao

From there, start alternating inhalations and exhalations: As you breathe in, he breathes out.

从那里开始，交互地吸入和呼出：当你吸入，他呼出。

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But there are all sorts of things, you can just breathe in and breathe out, and it's a real opportunity.

但也有很多种事情，你只需吸气呼气，实为难得的机会。

普林斯顿公开课 - 人性课程节选

I just encourage people to breathe, to practice being in touch with their breath, "Breathing in I relax, breathing out I release."

我只是鼓励人们调息，练习与呼吸建立联系，吸气，放松，呼气，释放“

普林斯顿公开课 - 人性课程节选

You breathe in, and breathe out.

吸气，呼气。

普林斯顿公开课 - 人性课程节选

The few occasions I saw her pause she would put a hand over her eyes, breathe in and out deeply, and that was when I would know she was exhausted.

NEWYORKER: The Pura Principle

But soon after, I developed a novel mathematical model which can be used by doctors and environmental specialists to quantify the effect of the pollutants on the lung function as measured by the peak expiratory flow rate-- which is essentially how much a person can breathe out in one breath.

WHITEHOUSE: Energy and Environment Latest News | The White House

Step 1 to 3 can be well practiced by using your mind, but when it comes to Step 4, take time for yourself, breath in and out, notice any discomfort in your body and breathe into this discomfort which is often experienced as coldness, stiffness, numbness, prickle, tightness etc.

FORBES: 5 Steps To Transform Your Life - Step 4