具体地说，这里讨论连接、读、写和释放连接等数据库函数。

In particular, database functions such as connect, read, write, and release connection are covered here.

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如果你没有为拷贝构造函数写正确的代码，就有可能造成list中对象的某些数据成员没有初始化。

If you do not write a correct code for the copy constructor, object within a list will have some data members uninitialized.

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车牌识别定位程序的部分功能，包括数据分析、绘图等等，自写曲率计算函数 。

Part of the license plate recognition locator feature, Data analysis, plotting, etc. , Since writing the curvature calculation function.

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