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您集邮的起因是什么……当读者见到的这些司空见惯的问题时,请不要觉得它有多么简单。因为回答问题的人起码不是一个简单的人。请看著名集邮家郭润康是如何回答这九个问题的。
What is the cause of your philatement ... When readers see these common issues, please do not feel it is how easy it is. Because at least the person answering the question is not a simple person. Please look at the famous collectors Guo Run Kang how to answer these nine questions.