We heard the whistle of a train.

我们听到了火车的汽笛声。

I heard police sirens in the distance .

我听到警笛声从来。

In big cities you always hear sirens all the time.

在大城市里, 你总能听到警笛声。

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

这些汽车听到来近的警笛声便停了下来。

The din in the factory ends abruptly when the noon whistle sounds.

当中午的笛声响起，里的嘈杂声顿停止了。

We heard the whistle of a train.

们到了火车的汽笛。

I heard police sirens in the distance .

到警笛从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能到警笛。

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

这些汽车到来近的警笛便了下来。

The din in the factory ends abruptly when the noon whistle sounds.

当中午的笛响起，工厂里的嘈杂止了。

We heard the whistle of a train.

我们听火车的汽声。

I heard police sirens in the distance .

我听声从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能听声。

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

这些汽车听来近的声下来。

The din in the factory ends abruptly when the noon whistle sounds.

当中午的声响起时，工厂里的嘈杂声顿时止。

We heard the whistle of a train.

我们听到了火车的汽笛声。

I heard police sirens in the distance .

我听到警笛声从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能听到警笛声。

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

这些汽车听到来近的警笛声便停了下来。

The din in the factory ends abruptly when the noon whistle sounds.

当中午的笛声响起时，工厂里的嘈杂声顿时停止了。

We heard the whistle of a train.

我们听到了火车的汽笛。

I heard police sirens in the distance .

我听到警笛从远处传。

In big cities you always hear sirens all the time.

城市里, 你总能听到警笛。

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

这些汽车听到近的警笛便停了下。

The din in the factory ends abruptly when the noon whistle sounds.

当中午的笛时，工厂里的嘈杂顿时停止了。

We heard the whistle of a train.

我们听到了火车的汽笛声。

I heard police sirens in the distance .

我听到警笛声从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能听到警笛声。

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

这些汽车听到来近的警笛声便停了下来。

The din in the factory ends abruptly when the noon whistle sounds.

当中午的笛声响起时，工厂里的嘈杂声顿时停止了。

We heard the whistle of a train.

我们听到了火笛声。

I heard police sirens in the distance .

我听到笛声从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能听到笛声。

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

这听到来笛声便停了下来。

The din in the factory ends abruptly when the noon whistle sounds.

当中午笛声响起时，工厂里嘈杂声顿时停止了。

We heard the whistle of a train.

我们到了火笛声。

I heard police sirens in the distance .

我到警笛声从远处传来。

In big cities you always hear sirens all the time.

在大城市里, 你总能到警笛声。

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

这些到来警笛声便停了下来。

The din in the factory ends abruptly when the noon whistle sounds.

当中午笛声响起时，工厂里嘈杂声顿时停止了。

We heard the whistle of a train.

我们火车的汽笛声。

I heard police sirens in the distance .

我警笛声从远处传。

In big cities you always hear sirens all the time.

在大城市里, 你总警笛声。

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

这些汽车近的警笛声便停。

The din in the factory ends abruptly when the noon whistle sounds.

当中午的笛声响起时，工厂里的嘈杂声顿时停止。