Workers remove these sticks to use the machinery.

VOA: special.2009.10.06

And so what happens when we remove these stops is that the piston slams up against the next pair of stops.

把挡板移开后活塞会,向上移动直道第二个挡板处。

麻省理工公开课 - 热力学与动力学课程节选

So we remove the stops, and the piston moves up, and now we remove one of these weights.

我们移走挡板，活塞向上移动，移走一个重物。

麻省理工公开课 - 热力学与动力学课程节选