n. an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
v. utter a yawn, as from lack of oxygen or when one is tired
n. 哈欠
vi. 打哈欠, 裂开
vt. 打着哈欠说
1. I always yawn when I am tired.
我总是在疲倦时打哈欠。
2. She tried to hide her yawn during the meeting.
她试图在会议上掩饰自己的哈欠。
3. It's common to yawn when you see someone else doing it.
看到别人打哈欠时，自己也打哈欠是很常见的。