Well, what happens over time is the fluid is moving while my curve is staying the same place so it corresponds to something like this.
随着时间的推移，流体会发生运动，曲线保持不动的话，情况就像是这样子了。
2
If you were thinking of a velocity field, that would measure how much fluid is passing through the curve in unit time.
想象一个速度场，它能够度量，单位时间内流体的量。
3
The laying position and well blowout pressure are analyzed and discussed briefly and the relationship curve of drill bit pressure drop vs flowrate and fluid density i.