Ferrosilite
铁辉石
🗣️ 情景例句
He did it in no time.
他马上做了那件事。
Which umpire will referee the baseball game?
不知道哪一个裁判要执法这场棒球赛？
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。