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。
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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