警笛

The policeman whistled for the motorcar to stop.

察吹笛令汽车停下。

I heard the wail of a police siren.

我听见笛尖叫。

I heard police sirens in the distance .

我听到笛从远处传来。

In big cities you always hear sirens all the time.

市里, 你总能听到笛。

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

这些汽车听到愈来愈笛便停了下来。

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

听到笛响起，他拚命地跑。