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Friendship is a kind of special dynamic interpersonal relationship, this paper tightly grasp it , and will make a research about friendship from the dynamic exchange perspective of costs and rewards.

友谊是一种动态发展的特殊的人际关系，本研究即紧紧把握这一特点，从友谊进展中的“付出”、“报酬”这种动态变化的影响因素来研究友谊。