在人机系统中，人和机器有它自身的独立性和功能，他们不是简单的机械混合，而是相互作用、相互依赖、相互共存的有机整体。
In this system, worker or machine has self independence and function, however, this system is not a compound system but an organic system characterized by interaction and interdependence.
机械系统运动方案的设计在整个机械设计过程中起着关键作用，决定着机器的产量、使用功能及整体性能。
The studying of mechanical motion systems plays a very important role in mechanical design in general, and is decisive to the output, function and overall performance of the machine.
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