单位时间内的订货次数 Order frequency per unit time
单位时间内的需求量 Demand per unit time
单位时间内移动的距离 distance moved per unit time
随着产品获得承认和成功，单位时间内的销售量以越来越高的速度增长。
As the product gains recognition and success, unit sales grow at an increasingly rapid rate.
单位时间内的流量就是一个小立体，它的底是曲面上的一块，它的高由向量场给出。
Well, it is the stuff that lives in a small box whose base is that piece of surface and whose other side is given by the vector field.
流动可变性是指每单位时间内的改变，例如河中水的流动或者公司收入和支出的资本流动。
A flow variable represents the change per unit of time, like the flow of water in a river or the flow of revenue and expenses into and out of a firm.
应用推荐