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2013-05-23 12:21
求翻译：With the invention of machines to make life easier and more enjoyable, sound levels around us have increased. Some of the machines are hair-dryers, air-conditioners, stereos, telephones, and lawn mowers. Unwanted or disturbing sounds are usually called noise pollution.是什么意思？ 待解决
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With the invention of machines to make life easier and more enjoyable, sound levels around us have increased. Some of the machines are hair-dryers, air-conditioners, stereos, telephones, and lawn mowers. Unwanted or disturbing sounds are usually called noise pollution.
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