1. The expiratory phase of the breathing cycle is when air is expelled from the lungs.

呼吸循环中的呼气阶段是将空气从肺部排出。

2. The expiratory muscles play a crucial role in helping to force air out of the lungs during exhalation.

呼气肌肉在呼气过程中起着关键作用，帮助将空气排出肺部。