Copos
病后衰弱； 腓肠肌痉挛
🗣️ 情景例句
That's very wise, Robbie.
这是很明智的 ，Robbie。
Let us take a break now.
让我们休息一下。
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。