警笛

The policeman whistled for the motorcar to stop.

察吹令汽车停下。

I heard the wail of a police siren.

我见的尖叫声。

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

这些汽车近的声便停了下。

I heard police sirens in the distance .

我声从远处传。

In big cities you always hear sirens all the time.

在大城市里, 你总能声。

When he heard the police sirens, he ran off as fast as his legs could carry him.

响起，他拚命地跑。