In the construction process of oil and gas drilling, the joint drill wear, eccentric wear and threaded partial adhesion caused drilling damage and then evolved into the major mine accidents.

在石油天然气钻井施工过程中，常常造成钻具接头磨损、偏磨及丝扣粘连，这是引起钻具损坏进而演化为井下事故的主要原因之一。

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Adhesion can provide continuous joint which is useful to reduce the structure weight.

胶接能够提供连续的面连接，有利于减轻结构重量。

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Authors consider that the joints' continuous passive movement has the active power of stimulating the re-growth of joint cartilage, preventing adhesion and stiffness of joints.

作者认为，关节持续被动运动具有刺激关节软骨增生，防止关节粘连和僵硬的积极作用。

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