ratio/ˋreʃo; ˈreIʃiəʊ/n [C] plural ratios a relationship between two amounts, written as two numbers that show how much bigger one amount is than the other〔表示两个数量之间关系的〕比﹐比例﹐比率: the ratio of sth to sth a school where the ratio of students to teachers is about 5:1 (=five students for every teacher) 学生和老师的比例约为 5 比 1 的一所学校