它表示树视图节点的加号按钮。

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

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函数性语言被频繁地用来构建编译器或者解析语言的工具，因为语言通常是用语法树表示的。

Functional languages are used frequently for building compilers or tools that parse languages because languages are normally expressed as syntax trees.

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它们可以表示为有序的向量、无序的组、链表、树、图或编程语言支持的其他形式。

They can be expressed as ordered vectors, unordered groups, linked lists, trees, graphs or other forms that the programming language supports.

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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