- travel of slide valve
- 滑: slippery; smooth
- 塞: fill in; stuff
- 行程: route or distance of travel; ...
- 活塞行程: piston path; piston stroke; piston travel; pistonstroke; stroke of piston; throw of piston; throw of poston; travel of piston
- 柱塞行程: plunger lift; plunger stroke; travel of plunger
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