differentials差价differentialadj.差别的；特定的；微分的n.差别；工资差额；差动齿轮；[数]微分differential speedadj.差速的differential index差异性指数differential order微分阶数differential ideal微分理想differential route运费低廉的交通线differential gauge微分计differential fibre改性纤维differential point差别点differential brake差动制动器differential group微分群