N-COUNT [usually singular]比;比率;比例 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. 比;比率;比例
In 1978 there were 884 students at a lecturer/student ratio of 1:15.
1978年有884名学生,师生比为1比15。
The bottom chart shows the ratio of personal debt to personal income.