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.
双语例句
例： The adult to child ratio is one to six.
成人与儿童之比是1比6。
例： In 1978 there were 884 students at a lecturer/student ratio of 1:15.
1978年，这里有884位学生，讲师与学生的比率是1比15。
例： The bottom chart shows the ratio of personal debt to personal income.
底部的图表显示的是个人负债与收入的比率。