Finally, what you really want are the text node children of the title element.
最后，真正需要的是title元素的文本节点孩子。
Elements don't actually have a value, they simply have text node children.
元素实际上并没有值，它们仅有文本子节点。
All children step: move from a node to all of that node's children.
所有子步骤：从一个节点移动到该节点的所有子节点。
Retrieves a list of children of a node.
get children：获取节点的子节点列表。
Similarly, a black parent with two black children does not represent a 4-node.
同样，有两个黑色子节点的黑色父节点也不代表4 -节点。
The child entries are only the immediate children of this node.
子项目仅是这个节点的直接子系。
We can simply write one function, which retrieves the children of a certain parent node.
我们能简单写一个函数，检索没有父节点的子节点。
We can simply write one function, which retrieves the children of a certain parent node.
我们能简单写一个函数，检索没有父节点的子节点。
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