ratio 

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the relationship between two groups or amounts that expresses how much bigger one is than the other

比;比例;比率

The ratio of men to women at the conference was ten to one/10:1.

出席會(huì)議者的男女比例為10：1。

The school is trying to improve its pupil-teacher ratio (= the number of teachers compared with the number of students). 該校正大力優(yōu)化其師生間的人數(shù)比例結(jié)構(gòu)。

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