Concen
abbr. control center 控制中心
🗣️ 情景例句
It won't take me long at all.
不需要花很长时间的。
Downy lips make thoughtless slips.
嘴上没毛，办事不牢。
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。