The tense system is based on two basic principles.

二是递归性，即时态在系统内可作重复选择。

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Part two, the research on the basic legal problems about registration system of real property.

第二部分，不动产物权登记制度基本法律问题研究。

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Part two, the research on the basic legal problems about registration system of real property.

第二部分，不动产物权登记制度基本法律问题研究。

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