"he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"
以上来源于: WordNet
V-I If you yawn, you open your mouth very wide and breathe in more air than usual, often when you are tired or when you are not interested in something. 打哈欠
She yawned, and stretched lazily.
她打了个哈欠，伸了个懒腰。
N-COUNT Yawn is also a noun. 哈欠
Rosanna stifled a huge yawn.
罗莎娜忍住了一个大哈欠。
I must swallow my yawns, for I hate the oil.
我不得不忍住哈欠，因为我讨厌油画颜料。
If the work is too hard for you, my boy, enjoy your yawns and may they bring you luck!
如果工作对你来说太辛苦了，我的孩子，那就好好享受你的哈欠吧，希望它们能给你带来好运！
Unfortunately, the few scientific investigations of yawning have failed to find any connection between how often someone yawns and how much sleep they have had or how tired they are.
不幸的是，少数针对打哈欠的科学调查未能发现人们打哈欠的频率与他们睡觉时长和疲劳程度之间有任何联系。
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