A ratio is a relationship between two things when it is expressed in numbers or amounts. For example, if there are ten boys and thirty girls in a room, the ratio of boys to girls is 1:3, or one to three.
例句
In 1978 there were 884 students at a lecturer/student ratio of 1:15...1978年有884名學生，師生比為1比15。The bottom chart shows the ratio of personal debt to personal income...下面的圖表顯示了個人負債與個人收入之比。
英漢詞典釋義
n.
比, 比例, 比率
The ratio of pupils to teachers was 30 to 1.學生和老師的比率是30比1。
英英詞典釋義
Noun
1. the relative magnitudes of two quantities (usually expressed as a quotient)