名词
中文翻译：比率
同义词：
['proportion', 'ratio', 'proportionate']
例句：
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1. The teacher gave the students a ratio of 50% to complete their assignments.
老师给学生们分配了50%的作业量。
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2. The company's profit margin is 30%, which is a good ratio for its industry.
该公司的利润边际为30%，对于其行业来说是一个不错的比例。
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3. The ratio of sugar to water in this recipe is 1:1, so it's easy to make.
这个食谱中糖和水的比例是1:1，所以很容易做。