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.

我笛的尖叫。

I heard police sirens in the distance .

我到笛从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能到笛。

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

这些汽车到愈来愈近的笛便停了下来。

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

到笛响起，他拚命。