警笛

The policeman whistled for the motorcar to stop.

警察吹警令汽车停下。

I heard the wail of a police siren.

听见警的尖。

I heard police sirens in the distance .

听到警从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能听到警。

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

这些汽车听到愈来愈近的警便停了下来。

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

听到警，他拚命地跑。