博文
英语学习- 口语句子-8- We tend to be grumpy when we are tired.
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we tend to be grumpy when we're tired.
https://www.forbes.com/sites/bryancollinseurope/2018/08/09/why-you-should-take-a-nap-every-day-and-how-to-get-away-with-it/#ff6a9171427a
https://blog.sciencenet.cn/blog-419883-1188164.html
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