differential rate

differential-rate的词性：
n.（名词）

1. A difference in wage rate paid for the same work performed under differing conditions.
工资差别：在不同条件下完成相同工作给付不同的工资

2. A difference in the transportation rate or the number of vehicles per unit time to the same destination over different routes, so as to equalize traffic.
交通运费差别：交通运费的差异；或在单位时间内途经不同路线到达相同的目的地的运输工具的数量差别，以便平衡交通

3. A difference in rates over the same route owing to differences in the commodities being transported.
商品运费差别：相同的路线因运输商品的不同而运费不同