yawn

She tried to hide a yawn during the long and boring history lecture.

(Chinese) 在漫长而乏味的历史讲座中，她试图掩饰一个哈欠。

His giant yawn let everyone in the room know that he was ready for bed.

(Chinese) 他那巨大的哈欠让房间里的每个人都知道他准备睡觉了。

I couldn't stop yawning all morning because I only slept for three hours.

(Chinese) 我整个早上不停地打哈欠，因为我只睡了三个小时。

When one person starts to yawn, others in the room often do the same.

(Chinese) 当一个人开始打哈欠时，房间里的其他人往往也会跟着打。