随着科学技术的飞速发展，人们对机械系统提出了愈来愈高的要求，如其精度、准确性、可靠性、舒适安全性、操纵快捷性等。
With the rapid development of technology, more and more requirements for machinery system are proposed, such as precision, stability, reliability, comfort and safety, simple maneuverability etc.
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