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。
Since XOR operations are commutative and associative, correct recovery is possible regardless of the creation sequence of log records.
由于XOR运算具有交换性和结合性，无论日志记录生成的次序如何都可获得正确的恢复。
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