名词
中文翻译：下降率
同义词：
['decrease rate', 'decrease in value', "decrease in volume例句：1. The company's sales have decreased by 20% since last year.（该公司的销售额自去年以来下降了20%。）"]
例句：
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1. The company's sales have decreased by 20% since last year.
该公司的销售额自去年以来下降了20%。
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2. The priceof oil has decreased by 5%since the beginning of the year.
自年初以来，油价已下降了5%。
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3. Thepopulation has decreased by 10%over the past decade.
过去十年间，人口减少了10%。