vertical downward welding 向下立焊
Vertical downward flow is 气流是竖直向下的
vertical downward flow 垂直下降流
vertical-downward welding 从上到下立焊
vertical downward pipeflow 垂直下降管流
Vertical downward flow wetland 垂直下行潜流湿地
downward directed vertical wall jets 竖壁贴附送风
downward vertical 垂直下降管
Using a vertical downward section in which flow is very slowly, water holdup in oil-water two phase flow is measured, and a good result is obtained.
通过采用一缓流的垂直下降段，测量油水两相流中的含水率值，获得了好的结果。
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
And now, you should imagine that you have this thing that when you slice it by a vertical plane, looks like a downward sparabola.
现在想象得到的图像,当你垂直切割它时，它是开口向下的抛物线。
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