A device consisting of fixed and moving parts that modifies mechanical energy and transmits it in a more useful form. 机床一个由固定和可移动部件组成的装置，可以把机械能转化为其他更为有用的形式
The technology of using the flows and pressures of fluids in sensing, control, and information-processing systems with no moving parts. 射流技术一种利用流体动力现象使不运动部件来完成传感、控制和信息传送等功能的控制技术
Oil the moving parts of this machine regularly. 要定期给这部机器的运转部件上油。
In order to reduce friction, the moving parts of a machine are often oiled. 为了减少摩擦，机器的可动部件常常涂上润滑油。
