Electroscope
n. 验电器\\n[化] 验电器
🗣️ 情景例句
I guess you're right.
说的也对。
What day was yesterday?
昨天是星期几？
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。