n.比率；比例
The ratios of 1 to 5 and 20 to 100 are the same. 1与5之比和20与100之比相同。
Men outnumber women here in the ratio of three to one. 此地男子数量以三比一超过女子。
The ratio of nursing staff to doctors is 2:1. 护士和医生的比例是2：1.
