以前树形控件是通过清单和链接创建的，因此用户必须使用制表键跳到每个树项目。

Previously, tree controls were created out of lists and links so the user had to TAB to each tree item.

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键生成器计算给定字符串的hash码，这个hash码被存储在DB 2内部的B -树中。

The key generator computes the hash code for the given string, and that hash code is stored in the DB2-internal B-Tree.

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树可以被视为B树，其中每个(内部)节点仅包含键(不是键值对)，并在其底部附加一层链式的叶子节点。

B + tree can be viewed as a B-tree in which each node contains only keys (not key-value pairs), and to which an additional level is added at the bottom with linked leaves.

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