For example, a film-maker might opt to include the background sound of an ambulance's siren while the foreground sound and image portrays an arguing couple.
例如，电影制作人可能会选择在背景中加入救护车的警笛声，而在前景的声音和图像中表现一对争吵的夫妇。
We walk for about an hour and a half, and then if we can resist the siren sound of the pub—which we usually can't—we come home.
我们走一个半小时，然后，如果我们能够忍受得了酒吧的警报声——通常我们忍受不了——我们就回家。
Another example is the word siren, familiar to us as the mechanical device that makes such an alarming sound when police cars, ambulances, or fire engines approach.
另一个例子是“警报器”这个词，是我们很熟悉的一个机械装置，当警车、救护车或消防车靠近时，警报器会发出警报。
We walk for about an hour and a half, and then if we can resist the siren sound of the pub – which we usually can't – we come home.
我们走一个半小时，然后，如果我们能够忍受得了酒吧里警报般的声音——通常境况下忍受不了——我们就回家。
It is caused by the Doppler effect (something similar happens when a police car or fire engine with its siren blaring drives past you, and the pitch of the sound suddenly drops).
这是由多普勒效应(类似一辆警车或消防车鸣着警笛从你身边经过，之后音高突然下降)引起的。
The cars had stopped at the sound of the approaching siren.
这些汽车听到愈来愈近的警笛声便停了下来。
As a special hydrodynamic sound generator, ultrasonic siren has applicative effects on viscosity reduction, scale removal on electric pump well.
作为一种特殊的流体动力式声波发生器，超声旋笛在电泵井防垢降粘方面有着显著的使用效果。
Under the background of Middle Eastern style music, it begins with a gradually-coming bell sound to bring out the following siren sound, signaling the morning sun gradually rising.
以中东风格为音乐背景，开始通过一个由远而近的钟声带出接下来的笛声，预示着太阳渐渐升起升起。
The very sound of an air-raid siren is enough to give my mother the horrors.
那空袭特有的声音就绝对就足够给我母亲这种种的恐惧。
The very sound of an air-raid siren is enough to give my mother the horrors.
那空袭特有的声音就绝对就足够给我母亲这种种的恐惧。
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