结合生物医学人体关节研究成果，研究了一种四连杆封闭链仿生关节；给出了一种由四连杆机构组成、智能MR阻尼器控制的多轴仿生膝关节机构；

Combining with the achievement of study on human-body joint of biologic medical science, a kind of four-bar link close-chained bionic joint was studied.

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她说，作为她的手封闭的链。

She said as her hand closed over the chain.

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同样重要的是，OER以授权学习者与老师的方式，揭开商业价值链以前的封闭系统。

Equally important, OER open up a previously closed commercial value chain system in ways that empower learners and teachers.

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