Question 2: The Introduction contains many content that not
relevant to this study. The authors are suggested to condensed to as
much as 3 pages.
Thanks for your thoughtful comments. We have revised and rewritten the
abstract section of the original manuscript, deleted Reviewer 2
suggesting tedious sentences, examined similar sentences and the
introduction with many irrelevant to this study, revised and deleted it,
and finally have compressed it to 3 pages. Delete lines 46-48, 51-57,
58-63 on page 3, lines 80-81, 85-94, 100-103 on page 4, and lines
111-115, 118-121, 124-126 on page 5 of the original manuscript. And
rewrite lines 58-71 on page 3 and 73-76 on page 4 of the original
manuscript.