如前所述，每个查询表达式都是泛型的，以表示表达式计算的值的类型。
As I mentioned earlier, every query expression is generically typed to denote the type of the value the expression evaluates to.
抽象语法树是一个表示为对象集合的表达式。
An abstract syntax tree is an expression represented as a collection of objects.
错误消息中显示的原因码 “XUTY0008” 表示 “替换表达式的目标节点不是单一节点”。
The reason code "XUTY0008" shown in the error message quickly points you to the fact that "the target node of a replace expression is not a single node".
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