Can I understand the rejection reason of an article by reading the reviewers' comments? My paper is rejected with this comment from editor:


  Unfortunately, the reviewers generally agree this paper should not be
  considered for publish in....


My question is do all the reviewers reject the paper?  

While, I read the reviewers's comment, some of them suggest some notations in order to improve my paper.
You can't really tell, unless it's explicit in the referee reports you receive. A referee could well give suggestions for improvements even if they advise rejecting the paper - they don't assume that just because the paper wouldn't appear in this journal it won't appear anywhere. It also doesn't matter whether all the referees recommended rejection - it is the editors that make the call, and that is what stands.