The first line defines a function.

第一行定义了一个函数。

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The line function takes four arguments, representing the points between which a line is drawn.

line函数接受四个参数，代表的是要在其间绘制线条的点。

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The IEnumerable function will generally begin with a "Return Iterator" block, which is a special case of VB's new anonymous, multi-line function syntax.

IEnumerabl的函数将通常以一个“Return Iterator”代码块开始，它是VB新匿名函数、多行函数语法的一种特例。

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