But the second part is not as clear - because the comparator isn't a container, so it doesn't feel like we're either getting or putting from a data structure.
但第二步有点复杂—因为比较器并不是容器，因此与从一个数据结构获得或存入值有所不同。
The ECS structure is defined in such a way that the document class, which creates a document container, ACTS like a wrapper for the Html, Head, Title, and Body elements.
ECS结构的定义方式使得创建文档容器的Document类成为了Html、Head、Title和Body元素的包装器。
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