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1·Humans take in oxygen and breathe out carbon dioxide.

人吸入氧气，呼出二氧化碳。《牛津词典》

2·The CO2 that astronauts breathe out is sucked away.

宇航员呼出的二氧化碳被吸走了。

3·Breathe out gently. Repeat six times.

用大拇指和食指捏住耳垂温柔的向下拉，轻轻的向外呼气，重复6次。

4·Breathe out as slowly as possible.

呼气也尽可能的缓慢进行。

5·Breathe out. We're getting plenty of oxygen.

吸进，呼出，我们得到很多的氧气。

6·Step nine: Breathe out through left nostril.

第九步：用左鼻孔出气。

7·Please breathe out slowly and then hold your breath.

请慢慢呼出一口气后，再屏住一会儿。

8·Take a deep breath, count to ten, and then breathe out.

深吸一口气，在心里数到十，然后呼气。

9·Breathe out through pursed lips as if you were whistling.

从闭合嘴唇中呼气，就好像在吹口哨。

10·Breathe out completely as you silently count from 1 to 8.

完全呼气，同时从1默数到8。