boolean expression tree 老式的布尔表达式树
The constructor for the SelectionListener implementation accepts a Boolean variable that defines whether the tree items are to be expanded or collapsed, depending on which button is selected.
SelectionListener 实现的构造函数接受一个布尔变量，该变量定义要展开还是折叠树项目，具体取决于选中了哪个按钮。
XPath provides primitives for moving around the XML tree, for selecting nodes according to name or by the use of a Boolean expression, and for applying functions to a sequence of nodes.
XPath 支持在 XML 树中移动、根据节点名称或通过使用 Boolean 表达式选择节点以及对一系列节点应用函数。
In the model, the forest is denoted by a Boolean lattice, each site of which is either a tree (represented by a value 1) or is empty (represented by a value 0).
森林火灾模型中森林用一个布尔型的网格来表示，其中的每一点可以取两个值：0—代表空地，或者1—代表树木。
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