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.
在十字头型发动机中，活塞连接在一根垂直的活塞杆上，活塞杆的下端又连接在一个叫做十字头的滑动构件上，十字头在导轨中上下滑动。
When they slide, they seem to be sliding down invisible slides way up in the air.
滑翔时它们在空中似乎时隐时现。
When they slide, they seem to be sliding down invisible slides way up in the air.
滑翔时它们在空中似乎时隐时现。
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