Sbt
n. Surface barriertransistor的简 写
🗣️ 情景例句
and his book
他的书
I would like to cancel the reserved seat.
我要取消已预定的位置。
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。