HasValue is true if the node has a text value or false otherwise.
如果节点有文本值，hasvalue值为true；否则，值为false。
If the tree node is expandable, it will get the state of expanded.
如果树节点是可展开的，则将会获得“expanded”状态。
If it's a contact list, then the root node should be.
如果这是一个联系人清单，那么根节点应该是。
If the cutover is successful, the old node is decommissioned.
如果切换成功，旧的节点将退役。
The program needs to check and see if the current node is the NULL list.
程序需要检查确认当前节点是否为NULL列表。
If the user is a female, she might be more interested in the "Woman" node.
如果用户为女性，那么她可能对“Woman”节点更感兴趣。
If the current node has the string, that's a base case (returning "true").
如果当前节点拥有那个字符串，则那就是基线条件(返回“true”)。
If the expression is true, the node is added to the results.
如果表达式为true，节点就添加到结果中。
If the expression is true, the node is added to the results.
如果表达式为true，节点就添加到结果中。
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