- 释义：
- n. 比，比率
- 构词：
- rat计算,考虑+io→n.比，比率，比例
- 例句：
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The ratio of pupils to teachers was 30 to 1.
学生和老师的比率是30比1.
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The ratio between the two sides is one to four.
双方人数对比是一对四.
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These problems include the high sex ratio and the growing population aging.
例如出生人口性别比偏高、人口老龄化等.
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