downward flow 下沉气流
downward flow bleaching tower 降流式漂白塔
downward flow rate 下降流量
vertical downward flow 垂直下降流
downward-flow biofilter 下向流生物滤池
Vertical downward flow wetland 垂直下行潜流湿地
rapid downward-flow sand filter 快速下流砂滤池
downward solid flow rate 下行固体流速
The process includes the waste purification from oil emulsion in Tilted-Plate Separator and the suspension separation in the downward-flow sand-gravel filter.
处理方法包括使用倾斜盘式分离器分离油乳化剂，使用下流式砂砾过滤器分离悬浮颗粒物。
This creates downward air currents. These downdrafts hit the surface of the planet, flow outward, and collide with each other, forming updrafts.
气流向下落在地球表面，向外流动，相互碰撞，如此一来就形成上升气流。
In a typical software system, function calls flow downward from higher-level components to lower-level ones; whereas events percolate up in the opposite direction. Figure 1 illustrates this pattern.
在典型的软件系统中，函数的调用流是从较高级部分到低级部分进行的；而事件是以相反的方向过滤的，如Figure 1所示。
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