汽车发动机进排气系统的噪声在发动机总噪声中占有重要分量，因此需要积极采取降噪措施。

The car noise admission and exhaust system of the engine is a very important problem, therefore we must adopt innovative technic to reduce noise.

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随着飞机广泛使用的涡轮风扇发动机涵道比的不断提高，风扇噪声在飞机总噪声中占有越来越突出的地位。

As the bypass ratio of turbofan engine is more and more high, fan noise is a more important part to the overall turbofan engine noise.

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汽车变速器是汽车的一个重要部件，它的工作噪声是汽车总噪声的重要来源，而且也是其自身质量优劣的重要标志之一。

Gearbox is one of the important parts of automobile, whose working noise is not only the important resource of total noise of automobile but also an important mark of its quality.

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