本文关注的是农民自发供给公共物品问题，结合具体案例，对社会资本在农村公共物品供给中的正负作用进行了分析。
This articles concerns the spontaneous supply of public goods and comprehensively analyze the role of social capital in supply of rural public goods with specific cases.
本文从股票期权激励制度产生的理论基础出发，进而分析其作用机理和正负两方面效应。
The paper from Incentive stock options the system produces the rationale embarks, Then analyzes its action mechanism and the positive and negative two aspect effect.
植酸对生态环境有正负两方面的效应，皆是其螯合作用和抗氧化作用的结果。
These two effects are the results of its function of chelation and antioxidant.
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