名词
中文翻译：Unknown
同义词：
['variation', 'variation rate', 'rate change', 'rate fluctuation']
例句：
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1. The company's sales rate has increased by 10% since last year.
该公司的销售额增长率自去年以来增加了10%。
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2. The rate of global warming is increasing at a rapid pace.
全球变暖的速度正在迅速加快。
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3. The rate of inflation in this region has been high recently.
该地区的通货膨胀率最近一直很高。