Atmospheric pressure then pushes the piston back down the cylinder, and if anything (such as a pump) is attached to the piston, some useful work can be done.

于是，气压就会再次将活塞推至汽缸底部。而假如有诸如水泵这样的物体与活塞连接，就可以在活塞的带动下完成一些工作。

youdao

At present, digital variable displacement axial piston pump has some problems.

目前，数字变量轴向柱塞泵还存在着很多问题。

youdao

The formulae in this paper are founded for axial piston pump whose rotor's structure is straight axis and auto-location type, but other type of pump can reference it.

文中算式以直轴自位式缸体结构的轴向柱塞泵为基本计算模型，但对于其他类型的轴向柱塞泵亦有很大参考应用价值。

youdao

To prevent this, milk is forced under extreme pressure and at high velocity to pass through tiny passages by a piston pump.

FORBES: Why Milk Isn't As "Natural" As You Think