Aha!歌词-

Aha!歌词由演唱，出自专辑《_583》，下面是《Aha!》完整版歌词！

Aha!歌词完整版

Aha!

Why Do We Yawn?

We involuntarily yawn when we feel sleepy.

Yawning increases our concentration

by giving our brains cold air. We also

yawn when we feel bored. Since carbon

dioxide builds up in our bodies, oxygen

becomes deficient. As a result, our

brains send signals saying we need to

yawn for more oxygen. Interestingly,

we cry when we yawn. The reason is that

yawning stimulates our facial muscles,

especially the muscles around our eyes,

and this makes tears come out.