它是SimpleRDB的通用模型的第一个类实体，但是在UML 2.0中没有它的对等体。这就是关联的签名没有与uml元素相关的形式参数的原因。
It is a first class entity in the meta-model of SimpleRDB, but it has no equivalent in UML 2.0. That is why the signature of the relation has no formal parameter that relates a UML element.
参数实体允许您定义一个基本模型，然后反复使用该模型，甚至在它之上构建另一可重用模型。
Parameter entities allow you to define a basic model, and then reuse that model over and over, and even build another reusable model on top of it.
首先，应用ug建立了巡线机器人的三维实体装配模型并获得各关键零部件的质量、惯量、质心点位置等参数。
First, build 3d solid assembly model of the inspection robot in UG and obtain the key parameters of mass, inertia and CM (center of mass).
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