该文件系统的基础格式建立在单一的 B+ 树的基础之上，这使得搜索的效率和可伸缩性增强。
The fundamental format of the file system is based on a single B+ tree, which makes search operations efficient and very scalable.
如果没有，就要使用树顶端的伸缩条来展开这个树，如图4所示。
If it is not, then use the elevator bar above the tree to expand the tree, as shown in Figure 4.
SECRET是一个关于可伸缩线形回归树的算法。
SECRET is a new algorithm for scalable linear regression trees.
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