Audio return

音响───sound;返送───foldback

I could hear the sound of a babbling brook.───我听得见小溪潺潺的流水声.

Alarmed at the first sound, we hit the dirt.───第一声警报一响我们就迅速卧倒.

Sound waves will not travel through a vacuum.───声波在真空里不能传播.

Can you sound your friend out and see whether he will help?───你能试探一下你的朋友,看看他能否帮忙 吗 ?

The new airplane flies at twice the speed of sound.───这架新式飞机以两倍于音速的速度飞行.

The sound has reached its maximum.───声音达到最高音位.

Peter heard the sound of gunfire.───彼得听见了枪炮声。

There was a strange inhuman sound.───有一种不像人发出的奇怪声音。