So, the gap assertion is not explicit. It's a mix of stating that this concept is researched in 2nd, accompanied by announcement the authors will study it in 3D. 任何研究最先也是最重要的一步是找出和叙述研究问题：也就是研究人员想要解决什么问题，他想要回答什么问题。一个研究问题可被定义为该关注的问题、与既有知识的落差或目前的规范偏差或标准，指出进一步了解和调查的必要。虽然很多问题最后可... http://research-gap95172.aboutyoublog.com/13853955/the-greatest-guide-to-research-gap是什么