This is great if you instantly need to be on the move after a nap, and you can bounceoutof your sleeping state and jump into work feeling refreshed and energised.
如果你需要在瞌睡之后马上清醒，这是很好的方法，你可以马上从睡眠中醒来精神百倍地投入工作。
2
So the bat sends out these pulses, very focused bursts of sound, and echoes bounce back.
所以蝙蝠发出这些脉冲，一种非常集中的声波，然后回声就会反弹回来。
3
So these rapid clicks that are sent outbounce off objects, maybe a group of fish swimming over here, a boat coming from over there.