因此，对该区进行植被恢复研究，不仅可以阐明制约植被恢复的关键因素，而且对植被生态系统的恢复重建提供理论依据。
So vegetation restoration research not only can illuminate the key restraint factor of vegetation recover, but can give the theoretic supports to the vegetation eco-system's reconstruction.
大位移井技术因其具有巨大经济效益并能够满足特殊作业的目的而得以迅速推广应用，但水平井段摩阻扭矩又成为了制约大位移井推广应用的关键因素。
ERD Wells are widely adopted due to its great economic benefits and its applicability for special purposes, while the drag along the horizontal section has limited the promotion of ERD Wells.
城市安全投入与安全经济效益是制约城市安全产出的两个关键因素。
Safety investment and its cost benefit are two key factors limiting the safety output of a city.
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