With this approach, a DLL must provide explicit functions for object creation and deletion.

使用这种方式，一个DLL必须提供显式的对象构建和删除函数。

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Water supply system is a complicatedly dynamic nonlinear system, it is difficult to simulate by using one or several explicit functions in pipe networks.

由于供水系统是非常复杂的动态非线性系统，在实际管网的运行中，很难以一个或几个统一的显式函数关系描述管网的工况。

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