名词
中文翻译：比率
同义词：
['percentage', 'proportion', 'ratio']
例句：
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1. The company's profit rate has decreased significantly in the past year.
这家公司的利润率在过去一年中显著下降。
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2. The speed of light is a constant, regardless of distance.
光速是一个常数，无论距离有多远。
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3. The rate of change in the population is a concern for policymakers.
人口增长率是政策制定者关注的问题。