换言之，机器或机械装置的每个零件是有一定的大小和形状，因此适用于同一类型的任何其他机器或机械装置。
In other words, each part 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.
在人类使用长矛狩猎或利用机器人制造机器零件之前，长矛和机器人都只不过是结实的物件罢了。
Until humans use a spear to hunt game or a robot to produce machine parts, neither is much more than a solid mass of matter.
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