单词：yawning
s. with the mouth wide open indicating boredom or sleepiness
yawning的用法和样例：
例句
- Yawning is a sign that you are sleepy or tired.打呵欠表示你困了或是累了。
- The researchers found that those who breathed through the nose rather than the mouth were less likely to yawn when watching a video of other people yawning.研究人员发现，在看别人打呵欠的视频时，用鼻子呼吸的人比用口腔呼吸的人打呵欠的几率要小。
- Although we associate yawning with sleepiness and boredom, its function appears to be to wake us up.虽然我们把打哈欠与睡意和厌倦联系在一起，但打哈欠的作用似乎是使人清醒。
- If you draw up on a coffee cup is yawning mouth, a cup of coffee ready when you wake up the brain when people see the cup but you will increase the hardship of Italy.如果在咖啡杯上画上一张正在打哈欠的嘴，当你喝咖啡准备醒醒脑子的时候，别人看到你的杯子却会增加困意。
词汇搭配
- yawning moment方向力矩
- frequent yawning欠, 数欠
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英语口语