The unstable tree processing is a bit different than the stable tree.
不稳定树的处理与稳定树的处理有一些不同。
If the candidate page is found in the stable tree, then it is merged and the candidate page freed.
如果候选页面位于稳定树中，则该页面被合并，候选页面被释放。
The first tree, call the unstable tree, is used to store new pages that are not yet understood to be stable.
第一个树称为不稳定树，用于存储还不能理解为稳定的新页面。
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