??? 情景例句
All right!
好的！
Is this a live program?
這是不是現(xiàn)場廣播節(jié)目？
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.
我們只要看一看蝙蝠回聲定位這一極不尋常的發(fā)現(xiàn)，就可以探究一下聲音在什么情況下有絕對的實用價值。