Pervitin
脱氧麻黄碱
🗣️ 情景例句
The aquarium was so exciting.
水族馆真的很好玩。
It isn't much.
这是微不足道的。
and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
我们只要看一看蝙蝠回声定位这一极不寻常的发现，就可以探究一下声音在什么情况下有绝对的实用价值。