对于在可重用软件组件设计中的COM对象循环引用问题，当前的各种解决方法都存在不足之处。
To remedy the shortcomings in the existing methods for the problem of circular reference count in COM object this study presents an indirect reference method.
输出完成后，通过向客户端流写入一个 NULL 对象，而且循环等待下一个客户端，从而刷新流。
When the output is complete, the stream is flushed by writing a NULL object to the client stream and loop awaiting the next client.
一个循环对象图不能够转换为树结构。
A cyclic object graph cannot be transformed into a tree structure.
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