笛声

The din in the factory ends abruptly when the noon whistle sounds.

当中午的笛声响起，工厂的嘈杂声止了。

We heard the whistle of a train.

我们听到了火车的汽笛声。

I heard police sirens in the distance .

我听到警笛声从远处来。

The cars had stopped at the sound of the approaching siren.

这些汽车听到愈来愈近的警笛声便了下来。

In big cities you always hear sirens all the time.

在大, 你总能听到警笛声。