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。
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.
不过对于VB用户来说，在不支持多行匿名函数的语言里，新语法看起来没那么清爽。
Unfortunately for VB users, it isn't nearly as clean in languages that don't support multi-line anonymous functions.
我们使用了str函数来解析这个多行字符串。
We use the STR function to parse the multi-line string literal.
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