警笛

The policeman whistled for the motorcar to stop.

警察吹警笛令汽车停下。

I heard police sirens in the distance .

到警笛声从远处传来。

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

这些汽车到来警笛声便停了下来。

In big cities you always hear sirens all the time.

在大市里, 你总能到警笛声。

I heard the wail of a police siren.

警笛尖叫声。

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

到警笛响起，他拚命地跑。