People's life and work become more and more crowded, increasingly using various auto and machine, so that enviroment noisy become more serious.
人们生活，工作越来越拥挤，越来越多地使用各种汽车和机器，因此环境噪声日益严重。
People's life and work become more and more crowded, increasingly using various auto and machine, so that enviroment noisy become more serious.
人们生活，工作越来越拥挤，越来越多地使用各种汽车和机器，因此环境噪声日益严重。
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