Sinetable
正弦台
🗣️ 情景例句
Hi, Dad.
你好， 爸爸。
Let's cross the bridge when we come to it.
既来之，则安之。
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。