... SUA System Use Area 系统使用区 SUB SUBstitution 替代，置换 SUB SUBstract 减 ...
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sub-substitution- 替代
According to the principle of substitution of the generalized kinematic pair, mobility of the complex loop mechanism composed by multiple sub — chain was studied.
并依据广义运动副替代原则，得到多个子链组合而成的复杂多环路机构的自由度。
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