Yawning

Yawning happens when we're tired or bored.
It brings more air to our lungs.
Seeing someone yawn makes us yawn too.
Yawning cools the brain and wakes us up.
Around 22 at night, I have to yawn.
I used to stay up late reading books, but now I don't.

疲倦或无聊时会打哈欠，它让肺部获得更多的空气。
看到别人打哈欠, 我们也会跟着打哈欠。
打呵欠使大脑降温，使我们清醒。
晚上十点左右，我就要打哈欠。
我过去常常熬夜看书，但现在不了。