Hold your breath for a moment and exhale.

屏息片刻，然后呼气。

The patient should inhale through the nose and exhale through the mouth.

病人应该通过鼻子吸气，嘴巴呼气。

The carbon dioxide is exhaled from your lungs.

二氧化碳是从你的肺里被呼出来。

the process of inhaling and exhaling air.

吸气和呼气过程。