英语翻译The idea of fighting a noise by making more noise sounds

英语翻译
The idea of fighting a noise by making more noise sounds strange,but that's exactly what motor engineers are doing in Germany and some other countries.
Carmakers' research and development laboratories have already proved that mixing in more noise with the help of loudspeakers can reduce the unwanted noise.
Physicists have known about the technique for a longtime.Sound is made up of pressure waves in the air.If two sound waves of the same frequency (频率) mix so that the highest point of one wave happens.At the same time with the lowest point of the other wave,the result is no sound.Therefore,by producing a perfect copy of the noise and delaying it by half a wave cycle (周期),we can kill the unwanted noise.Using this technique many carmakers are racing to develop noise-killing systems both inside and outside the cars.
Another good thing about the use of noise killing systems is that it saves the need for a silencer,which not only reduces the weight of a car,but also makes the motor burn less oil and work better.
Some engineers believe that the noise-killing system will be used in most cars in 1996.But the carmakers haven't decided if they will put it into production because it would add several hundred dollars to the cost of their cars.
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用制造更多的噪音来抗拒噪音的想法听起来很奇怪,但是这却是德国和其它国家的很多发动机工程师正在做的事情.
汽车制造商的研发实验室已经证实：用扬声器来混合更多的噪音,可以减少不需要的噪音.
物理学家早就知道这项技术.声音是由压缩空气波造成的.如果2种同频率的声波混合,一种声波的最高点就产生了,同时,随着另外一种声波的最低点,出现的结果就是没有声音.所以,产生和噪音一模一样的声波,并且延迟半个声波周期,我们就能消除不需要的噪音.许多汽车制造商使用这项技术来消除汽车内和汽车外的噪音.
使用这项噪音消除技术的另外一个好处就是,这能使消音器省下来,这不仅仅减少了汽车的重量,同时也是发动机油耗降低,更好地工作.
一些工程师认为这项噪音消除系统将在1996年应用在汽车制造上.但是汽车制造商并没有决定应用在生产上,因为这将使他们的汽车成本每台增加几百美元.