Is "可以来 (ke3 yi3 lai2) ..." an idomatic way to say "please bring me ..."? The vocabulary flashcard website "Memrise" has in one of its Chinese menu learning modules as entry:


  Word: 可以来...
  Definition: please bring... (food or dish)


But one of the comments says:


  I thought this might mean something
  like "bring me a plate" in English. But I
  can't find any reference to this
  phrase. I think it might just mean
  "can come". 


So is this a mistake that should not be in something purporting to teach Chinese? Is the commenter right or wrong? If this is the wrong way to say it, is there a right way?
It is a euphemistic way to say so, as it would seem more polite.

We would use subjunctive mood/subjonctif to translate this expression, as "Could I have..." or "Puis-je avoir...". Note that this is always in the form of a question, so please do not forget to add "...吗？" in the end.