course course of development
n.
经过,进程,方针,路线,跑道,课程,一道菜
mileage
mile.age 也作 mil.age
n.（名词）
Total length,extent,or distance measured or expressed in miles.
英里数,英里里程：用英里测量或表达的总长度、广度或距离
Total miles covered or traveled in a given time.
里速度：在给定时间内运行或行驶的总英里数
The amount of service,use,or wear estimated by miles used or traveled:
里程：以英里计算的运行、应用或消耗的数量：
This tire will give very good mileage.
这个外轮胎可以行驶许多英里
The number of miles traveled by a motor vehicle on a given quantity of fuel.
行车里程：在给定的油量内一部机动车所行驶的英里里程
An allowance for travel expenses established at a specified rate per mile.
按英里里程计算的补贴：以每英里的特定比率所认可的旅行消费的津贴
Expense per mile,as for the use of a car.
每英里的费用,用于汽车
Informal The amount of service something has yielded or may yield in the future; usefulness:
【非正式用语】 利益,好处：一种物品已提供或可在未来提供的益处；用处：
a tape player that still has a lot of mileage left.
一个仍然可以使用很多时间的录音机
