Yawn
打哈欠
Sometimes people feel sleepy.
有时人们昏昏欲睡。
They can't stay interested in what they are doing.
他们对所做的事情抬不起精神。
That is when they open their mouths wide.
这时他们就会张开大口。
We call this a yawn. It makes a pretty silly face.
我们称之为一个哈欠。打哈欠会让人们的脸看起来很难看。
Why do people do it?
人们为什么这样做?
Scientists do not know much about yawns.
科学家对打哈欠知之甚少。
But they have some ideas.
但是他们对此有一些看法。
Our bodies get tired.
我们的身体感到很累。
Our minds get tired, too.
我们的身心也感到很疲倦。
A tired mind needs air. So we yawn.
一个疲惫的心灵需要空气。所以我们打呵欠。
The quick yawn takes in air.
快速打呵欠会吸进空气。
And the air wakes up our mind.
空气会让昏睡的思想醒过来。
But not for long. Watch out!
但是不会太久。小心!
Here comes another yawn.
又来了一个哈欠。
WORD BANK
词汇表
sleepy
困乏的；欲睡的
yawn
呵欠，打呵欠
wide
宽的；广阔的
scientist
科学家
mind
头脑；智为；精神
