(69)比率和比例 (Ratio and Proportion) 4-6 级 例如: It is in ratio of X to Y The X/Y ratio is X:Y. of A to B The ratio is X:Y. between A and B The proportion of A to B is X to Y. (70)最大和最小(Maximum and Minimum) 2-6 级 例如: speed have the maximum ...