1·There are four types of channels on enterprise technology spillovers: Model and replication effects, competition effects, the associated effects, human capital flows.
外商企业技术外溢有四类渠道：示范和模仿效应、竞争效应、联系效应、人力资本流动。
2·As economic rationale for this special treatment, policymakers often cite positive externalities generated by FDI through productivity spillovers to domestic firms.
对于给予外企这些特殊待遇的经济解释，政策制定者们常常引证说明，FDI对国内企业的生产效率外溢，可以产生正的外部效应。
3·Technology spillovers are an important gain of host country from FDI.
技术外溢是一国从FDI中获得的重要社会收益之一。
4·And nobody explains the transmitting mechanism of knowledge spillovers as for the current literature.
而且现有的文献对知识外溢的具体传导机制未作阐述。