Her answer was so hushed that it seemed barely more than an exhalation of air .

她回答我时的嘘声如此之大，几乎像是呼出的一口空气。

Then exhalation releases the lower back muscles , facilitating the stretch .

之后的呼气又放松那些肌肉，实现伸展。

But what if the bubbles came not from the black hole 's steady exhalation , but from a relatively recent black hole belch ?

但是，如果这两个泡泡不是来自于黑洞的稳定的呼出，而是出于近期黑洞的一次喷发呢？

In addition , they exchange more air with each inhalation and exhalation .

另外，随着每次吸人和呼出，它们交涣更多的空气。

Practise your sink downs and get focused on your exhalation . You 'll enjoy your swimming more and your stroke will benefit greatly .

进行你的下沉练习并把重点放在你的呼气上，你将更享受你的游泳，你的划水也将大大受益。