Many of the basiclinkage configurations have been incorporate into machines designed centuries ago, and the term we use to describe then have change over the year.
In the field of mechanics, linkage mechanism can be seen as the original structure model theoretically of all other basic mechanisms.
在机械学领域，连杆机构可视为其它基本机构的理论结构原型。
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On this basis, it emphasized how to establish the node basic information database and the restricting relation database, and constructed out the mathematic model of the planar linkage mechanism.