Terms for subject General containing piston-cylinder

English	Chinese
a piston plays within a cylinder	活塞在汽缸内自由地运动
a piston slips in and out of the cylinder	活塞在汽缸中作往复运动
suppose a cylinder with open end up is closed by a piston	假定一个开口朝上的气筒用一个活塞封闭起来
the piston is made in the shape of a cylinder	活塞做成圆柱形