Backspring
倒缆; 反向弹簧
🗣️ 情景例句
Where's Mom?
妈妈呢？
New lords,new laws.
新君立新法。
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。