这个流量度量了，单位时间内通过s的烟雾的多少。
So, this flux measures how much smoke is passing through s per unit time.
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.
看这儿，左边的这个是单位时间内,从区域里出来的流量。
Physically, see, this guy on the left is the total amount of stuff that goes out of the region per unit time.
随着注入压力、注入流量以及注入时长的增加单位时间的总热损逐渐减小，但是降低幅度变缓。
The total heat loss per unit time decreases gradually as the injection pressure, injection flow rate and injection time increase, but the decrease extent reduces gradually.
最重要的是溶质的纯度和流量，即单位时间内产生化合物的量。
Important is the degree of solute purity and the throughput, which is the amount of compound produced per unit time.
收入是某一单位时间内收益的流量，而货币是一个存量，即某一时间点上一个特定的金额。
Income is a flow of earnings per unit of time. Money, by contrast, is a stock: it is a certain amount at a given point in time.
收入是某一单位时间内收益的流量，而货币是一个存量，即某一时间点上一个特定的金额。
Income is a flow of earnings per unit of time. Money, by contrast, is a stock: it is a certain amount at a given point in time.
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