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。

youdao

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。

youdao