适用于液体，半流体的自动包装。
液流分成近似相等的两部分，一半流体的压力使阀门开启，而另一半流体使阀门关闭。
The flowing stream divides into two approximately equal parts; half the flow tends to force the valve open while the other half tends to force it closed.
所有板块都在缓慢移动，因为它们漂浮在密度更大的半流体地幔上，也就是地壳和地核之间的那一层。
All are slowly moving because the plates float on a denser sem-iliquid mantle, the layer between the crust and Earth's core.
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