本文介绍了英国、美国、日本的一些科学家在降低飞机噪音、铁路噪音及空调噪音方面所做出的探索。
This article introduces the efforts made by some of British, American and Japanese scientists to reduce airplane noise, railway noise and air conditioning noise.
这栋楼离铁路很近，噪音很大。
在波士顿的铁路系统中，其环境噪音水平与飞行中的飞机不相上下，虽然它们听起来不大一样。
On the subway system here in Boston, the ambient noise levels are very comparable to the level on an airplane, although it sounds very different.
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