/ˈreɪ.ʃi.əʊ/

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.

出席会议者的男女比例为10：1。

The school is trying to improve its pupil-teacher ratio (= the number of teachers compared with the number of students). 该校正大力优化其师生间的人数比例结构。