[angelia-xy]

yawn：打哈欠

Many a time, yawing does not mean feeling asleep, but a sign give by your brain, indicating lack of oxygen.
很多时候，打哈欠并不代表犯困，而是你的大脑给你一个信号，它有点缺氧了。

next one: n

PS: 我是不是已经犯规了啊？