清洗干净的零件有相对运动部分应适当抹上液压油进行装配。
The washed components which have relative motion should add the appropriate hydraulic oil.
在无相对运动的情况下，也可以有摩擦力的作用。
Frictional forces may also act when there is no relative motion.
机构被定义为：“是由刚体或者有承载能力的物体连接而形成的组合体，它们在运动时彼此之间应该具有确定的相对运动。”
A mechanism has been defined as "a combination of rigid or resistant bodies so formed and connected that they move upon each other with definite relative motion."
机构被定义为：“是由刚体或者有承载能力的物体连接而形成的组合体，它们在运动时彼此之间应该具有确定的相对运动。”
A mechanism has been defined as "a combination of rigid or resistant bodies so formed and connected that they move upon each other with definite relative motion."
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