What are the sorting requirements on an associative container?

对于一个关联容器来说，排序要求是什么？

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All containers are models of the concept container; more refined concepts, such as Sequence and Associative container, describe specific types of containers.

所有容器都是概念容器的模型；更多精致的概念，就像sequence和Associative Container，在容器类型中有详细描述。

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