Its body is an expression.

其主体是一个表达式。

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Its second job, once an expression has been deemed valid, is to break the input stream into its component pieces and deliver those to you in some useful fashion.

一旦认为某个表达式是有效的，则它的第二项工作是将输入流分解成其组件块，并以某个有用的方式将它们提供给您。

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The W3Eval applet can't make your trusty HP-41 easier to use -- as its name implies, it's an expression evaluator that runs only on the Web.

W3Eval applet 无法让您可信赖的 HP-41 更易用，正如它的名称所暗示 ― 一个只能运行于 Web 的表达式求值程序。

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