它表示树视图节点的加号按钮。

That represents a plus sign button of a tree view node.

youdao

表示树视图信息的最重要的类之一是Content provider类，它负责向树观察器提供适当的内容。

One of the most important classes to represent tree view information is a content Provider class, which is responsible for providing the proper content to the tree viewer.

youdao

以八叉剖分来建立一棵顶点树，用以表示整个网格模型的数据结构。

A vertex tree is built to represent the data structure of the models by octonary subdivision.

youdao

As you know, in classical literature the dead are referred to as shades, but here in Milton's simile "shades" merely means "shade trees."

在古典文学里，逝者常被用树荫来指代，而在这里弥尔顿的比喻“树荫“仅表示“叶绿成荫的树“

耶鲁公开课 - 弥尔顿课程节选