Expression — Only examines tree content (element values) returning the result of the expression.
表达式——仅检查返回表达式结果的树内容(元素值)。
You have the ability to add new data types or elements of the message tree for use in the expression.
您可以添加消息树的新数据类型或元素，以便在表达式中使用。
One proposed option would be passing in some source code and being returned an expression tree instead of just a compiled assembly.
另一种可能是传入一段源代码并返回一颗表达式树，而不是一个编译好的程序集。
A syntax tree can be created from an entire file or just a loose statement or expression.
我们可以从完整的文件创建语法树，也可以从松散的声明或者表达式生成它。
An abstract syntax tree is an expression represented as a collection of objects.
抽象语法树是一个表示为对象集合的表达式。
You can also convert the data in the expression tree into another domain (such as XML).
你也能将表达式树中的数据转换到其他的域的数据形式(如xml)。
If model data referenced by a value binding expression is no longer available or has changed prior to the component tree being restored, it can result in portions of the tree being dropped.
如果一个值绑定表达式引用的模型数据不再可用，或者在组件树被恢复之前发生了更改，那么组件树的一些部分将被撤销。
Libraries are guaranteed that once they have a reference to an expression tree, that expression tree will never change.
函数库被保证，一旦这些函数库引用了一个表达式树后，表达式树就不再改变。
Reason about the data in the expression tree, and do custom processing over it.
推断表达式树内数据，并对它做自定义处理。
Instead, it can analyze the expression tree, discover what you want done, and then decide how to do it.
查询的执行次序和途径并非强制指定的，相反，它可以对表达树进行分析，以发现你所期望的结果，然后再决定如何处理；
No simple non-recursive procedural expression accesses all elements, although many libraries include helper functions for walking the tree.
简单的非递归过程表达式并不能访问所有的元素，尽管许多库都包含有帮助功能，可以用于遍历树。
Picture of parse tree for a single integer expression.
单个整数表达式的解析树的图片。
Item 2 is interesting, because it means that you can write a lambda expression into an expression tree, reason about it, etc, and then turn it into a callable delegate.
其中第二条是很有趣的，因为它意味着你能将一个lambda表达式复制进一个表达式树，推断它，并将它转换为一个可调用委托。
Use the .Compile() method to turn the expression tree into a delegate so that you can execute it.
用.Compile()方法去将一个表达式树转换为一个委托，然后你可以执行它。
You can use XSL: copy-of to copy the whole IDN tree to the output, as before, but you can also use the variable in a path expression without a node-set conversion.
与以前一样，可以使用xsl： copy- of将整个idn树复制到输出，但是也可在路径表达式中使用该变量而不需要转换成节点集。
Figure 1: Parse tree for a single integer expression.
图1：单个整数表达式的解析树。
XPath provides the expression language necessary to locate and retrieve individual nodes or node collections from the HTML document tree.
XPath提供从HTML文档树定位和检索单个节点或节点集所需的表达式语言。
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。
An expression tree is a data representation of the lambda expression in a form that is easy for you to read and reason about the lambda expression in.
表达式树是lambda表达式的一种数据表示形式，它能使你更方便地读取和推断lambda表达式。
The data is then indexed using techniques such as XML pattern expression indexing, B-tree structural indexing, structural indexing, content or keyword indexing, and others.
然后，数据被使用诸如XML模式表达式索引、B-树结构索引、结构索引、内容或关键字索引之类技术以及其他技术进行索引。
Fault tree model is the graphical expression of connection of basic events which result in system fault, and used in qualitative and quantitative analysis of system fault model.
故障树模型是导致系统失效的基本事件之间逻辑关系的图形表示，应用于系统失效模型的定性和定量分析。
He has a great diagram there showing the expression tree representation of a few lambda expressions.
他在那篇文章里用了非常好的图表来表现说明一些Lambda树的表达式树表示形式。
The IDN, or a sub-tree of it, can be in the select expression of xsl:apply-templates, allowing the tree to be processed in the same manner as an XML input document.
IDN或其子树可以出现在xsl:apply-templates的select表达式中，允许按照与XML输入文档相同的方式处理。
Edward leaned against a tree and stared at me, his expression unreadable.
爱德华靠在一棵树上，目不转睛地看着我，他的表情难以琢磨。
If you ever tried to walk on a falling tree log, you understand what the expression means.
如果你曾经尝试在圆木上行走，你就会明白这个词语的意思了。
To solve the problem, the concepts and formal definitions including direct classification schema, tree classification schema, classification rule, and family constraining expression were presented.
为了解决这个问题，给出了直接分类模式、树分类模式、分类法则和科目约束表达式等概念和形式化定义。
To solve the problem, the concepts and formal definitions including direct classification schema, tree classification schema, classification rule, and family constraining expression were presented.
为了解决这个问题，给出了直接分类模式、树分类模式、分类法则和科目约束表达式等概念和形式化定义。
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