The three guide rods are set parallel mutually between the top cross beam and the lowerpiston and distributed in an equilateral triangle.
在该三根导杆的上端固定连接有所述顶横梁；在该三根导杆的下端则固定连接有所述活塞；
2
Upper and lowerpiston rings are arranged inside a piston gaseous ring groove, and openings on the two-piece piston rings are mutually staggered.
在一个活塞气环槽内设有上下二片活塞环，二片活塞环上的开口相互错开。
3
In crosshead-type engines, the piston fastens to a vertical piston rod whose lower end is attached to a sliding member called a crosshead, which slides up an down in guides.