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。
This pressure then forces the piston back down producing mechanical work.
这种压力迫使活塞则回落生产机械工作。
In a HFPE, the free piston assembly is driven back and forth between two outer dead centers by fuel energy, and at the same time hydraulic oil is pumped out for energy.
在左、右动力腔的交替驱动下，HFPE的活塞组件在腔体中作往复直线运动，同时泵出液压油驱动负载工作。
Two coils move a piston back and forth magnetically at a constant force.
两组线圈在一个连续电磁力的作用下来回移动一个微型活塞。
The piston then moves back up the cylinder to eject the burnt fuel ready for another cycle.
活塞然后移动备份汽缸燃烧的燃料弹出另一个循环准备。
A tremendous number of particles constituting the gas are moving in all directions. They bombard the walls and the piston, bouncing back like balls thrown against a wall.
构成气体的数量极大的粒子是向各方面运动的，它们撞击容器的壁与活塞，撞了又跳回来，正如掷到墙上的球一样。
Two coils move the piston back and forth magnetically at a constant force.
两组线圈在一个连续电磁力的作用下来回移动一个微型活塞。
The piston then travels back in the other direction and compresses the refrigerant gas causing a large increase in pressure.
活塞然后向反方向移动，压缩气态制冷剂，引起压强急剧升高。
Now you see the piston, and the metal ring; this parts will insert into the back end of the barrel. the end cap you are seeing the from T1 test shot, not good yet.
看到活塞了吧，还有金属环(会塞入笔馆尾端)，你看到的尾塞是第一次试模，还不漂亮。
The piston pump can draw back excessive oil to prevent stains on materials.
活塞泵还可将多余的机油抽回，因此可防止布料受到污染。
Just connect it to an air supply and the piston goes back and forth.
只要将它连接到一个空气供应和活塞在跑来跑去。
Just connect it to an air supply and the piston goes back and forth.
只要将它连接到一个空气供应和活塞在跑来跑去。
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