In other words, each pert of a machine or mechanism is made to a certain size and shape so it will fit into any other machine or mechanism of the same type.

• 换句话说，一台机器或一个机械装置的任何一个零件都要制成一定的尺寸和形状，使其能够装在同类型的任何一台别的机器或机械装置上。