一旦建立了工厂，就可以开始构造树了。

Once a factory is available, you can begin to construct the tree.

youdao

这在构造树的方式方面提供了灵活性，但是也意味着由您负责构造树。

This provides flexibility in the way the tree is constructed, but means it is your responsibility to "build out" the tree.

youdao

其它类型的节点拥有左 HCNode 和右 HCNode 的引用，以便于构造树。

The other types of node hold references to left and right HCNodes so as to construct the tree.

youdao