笛声

We heard the whistle of a train.

我们到了火车的汽笛声。

I heard police sirens in the distance .

我到警笛声从远处传。

In big cities you always hear sirens all the time.

在大城市里, 你到警笛声。

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

这些汽车到近的警笛声便停了。

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

中午的笛声响起时，工厂里的嘈杂声顿时停止了。