When the cylinder moves backward, the piston is driven to travel backward and generates negative pressure in the front chamber of the cylinder.
当气缸向后运动时，拉动活塞向后，料缸前腔产生负压。
After the piston reaches BDC, or the lower limit of its travel, it begins to move upward.
在活塞到达下止点时，或者是活塞下限时，活塞开始向上运动。
The constant reversal of the piston travel sets up inertia forces, which increase Both with the weight of the piston and with its speed.
活塞的不断往复运动产生了惯性力，惯性力随活塞的重量及其速度的增加而增大。
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