推断表达式，然后将他们转换为委托并调用他们；

Reason about expressions, then convert them to delegates and call them.

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也可以建立布尔表达式以调用方法。

You can also set up the Boolean expression to call a method.

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当请求类型与正规表达式匹配时，就会调用处理器函数。

The handler function is called when the request type and the regular expression match.

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第一个参数是另一个表达式；这个表达式调用mod函数。

The first is another expression; this expression calls the mod function.

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该表达式还可以采用方法调用的形式。

The expression also can take the form of a method call.

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不能在表达式中使用其名称来调用它。

You cannot call it by using its name in an expression.

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表达式的值（如果表达式存在的话）将返回到调用函数。

The value of expression, if the expression is present, is returned to the calling function.

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表达式的值（如果表达式存在的话）将返回到调用函数。

The value of expression, if the expression is present, is returned to the calling function.

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