Q:鲸鱼为什么要喷水?

A:鲸鱼浮出水面利用喷水口呼吸,喷的水是由气体、冷凝水和体内黏液组成。一分钟呼吸5-6次,这样就可以长时间屏住呼吸潜水。

趣味知识:

龙涎香是抹香鲸的分泌物,可以做香水,也是一种中药,古代人以为是海里的龙睡觉时流出的口水凝固而成,固称龙涎香。

napkin [ˈnæpkɪn] 餐巾;餐巾纸
clean [kliːn] adj.干净的; v.打扫
dirty [ˈdɜːrti] 脏的
both [boʊθ] 两个,两个都

Your hands are clean.
Are your hands clean?
Keep your hands clean.
I clean my room.
This classroom is very clean.
Both napkins are clean.
Both my mum and dad are teachers.
Both my mum and dad are 35 years old.

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