它还定义了一个struct类，用来定义任意的数据聚合，此外，还定义了特殊的类any，它可以用来表示任何内置或导出类型，因而它也就成了动态类型化(dynamic typing)的基础。
It also defines a Struct class for defining arbitrary data aggregations, and the special class any which can be used to represent any built-in or derived type and thus is the basis of dynamic typing.
一个dll可以定义两种类型的函数：导出函数和内部函数。
DLL can define two kinds of functions: exported and internal.
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