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.

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。

youdao

Interpretative declaration made upon signature and confirmed upon formal confirmation.

签字时的解释性声明，并在正式确认时作了重申。

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A formal concept of dynamic group signature is given. Then we discuss the requirements of security and the principles of estimating efficiency.

给出了动态群签名的正式定义，并讨论了它需要满足的安全性要求和其有效性的评价准则。

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Kubrick would reveal an affinity with that perspective as he developed his signature filmmaking style, an icily formal, deliberately paced approach that conveys a clinical, third-person-omniscient point of view.

CNN: Dr. Strange Love