1.现在一般的艾斯维尔的期刊都要那个，具体是否需要投稿系统里应该有
2.可以分开，也可以合在一起

1. 就是说明你这篇paper的，创新之处
2，放在一起也行

ps，如果你审稿人没找够，可以找我，尽量帮说好话

需要HIGHLIGHT，见：http://www.elsevier.com/journals ... 2/guide-for-authors
Highlights are mandatory for this journal. They consist of a short collection of bullet points that convey the core findings of the article and should be submitted in a separate file in the online submission system. Please use 'Highlights' in the file name and include 3 to 5 bullet points (maximum 85 characters, including spaces, per bullet point). See http://www.elsevier.com/highlights for examples，