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Submission of a manuscript implies： that the work described has not been published before （except in the form of an abstract or part of a published, review,or thesis）：that it is not under for publication elsewhere; that its publication has approved byall co-authors,if any,as well as-tacitly or explic- by the responsible authorities at the institution where the work was carried out. The author warrants that his/her contribution is original： that he/she Ires full vower to make this rant.[第一段]