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铰链是运动机构的基本组成部件,它的基本型式有日常生活中常见的,由规则曲面组成并绕固定点或固定轴回转的运动副。另一种就是动物体内的某些关节。在对人体的关节及某些动物的骨关节面研究中发现,它们可以随意改变运动周期、频率、幅度和方向,并在各种位置处于稳定状态。这些骨关节面为非规则曲面,且不绕固定点或固定轴转动,其转动瞬心为一空间曲线,故称这种特殊铰
The hinge is the basic component of the movement mechanism. Its basic type is the movement pair common in daily life and composed of regular surfaces and revolving around fixed points or fixed shafts. The other is some joints in animals. In the study of human joints and some of the animals’ articular surfaces, they found that they are free to change their cycle, frequency, amplitude and direction, and are stable at various locations. These bone and joint surfaces are irregular curved surfaces, and do not rotate around the fixed point or the fixed axis, and the instantaneous center of rotation is a spatial curve, so this special hinge