Datalink is used to reference an object stored external to a database.
数据链接用来引用数据库之外存储的对象。
In this case, there is an external reference to the nested function, and the nested function retains its reference to the call object of the outer function.
如果内嵌函数只是在外部函数中使用到，那么对内嵌函数的唯一引用就是调用对象自己。
When the source code for the calling executable is compiled or assembled, the DLL function call generates an external function reference in the object code.
DLL 函式呼叫会在编译或组译呼叫可执行档的原始程式码时，在物件程式码产生外部函式参考。
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