You can use some of the core widgets as UI controls, such as the menu widget, tabs set, tree widget, and more.

可以使用其中一些核心小部件作为UI控件，比如菜单小部件、选项卡集、树小部件等等。

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Query expressions are the core units or nodes that are assembled in a tree to specify a CriteriaQuery. Figure 1 shows the hierarchy of query expressions defined in the Criteria API.

查询表达式是在一个树中组装的核心单元或节点，用于指定CriteriaQuery。

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To study tree rings, researchers generally take a pencil-sized core from a tree.

为了对年轮进行研究，研究人员通常会从树木取出一块铅笔大小的核心部分。

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"For us, building your tree usually starts with census records and birth and marriage and death, and those are the core of doing your family history, " Godfrey said.

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