ratio

/ˈreɪʃiˌoʊ/

the relative magnitudes of two quantities (usually expressed as a quotient)

中文释义：比例；比率

The ratio of boys to girls in the class is three to two.

班上男生与女生的比例是三比二。

A high student-to-teacher ratio often means less individual attention.

高师生比通常意味着较少的个别关注。