12月月月末投了一篇，1月17号收到回信，需要修改，如下。这是说明需要大改吗？审稿意见全是关于摘要、引言和结论的，还建议英文找人润色。完全没有提及实证，这说明实证部分还没看到吗？返修回去的下一步是不是还要再审几次呢？修改有时间限制吗？


I have now received a report on your paper in which the referee makes a number of recommendations for improvement. Whilst I am unable to accept the paper for publication in its present version, therefore, I should be happy to reconsider it if you were to revise it carefully along the lines suggested by the referee.  I note that some of the revisions suggested by the referee are quite substantial and I hope that you will be willing to undertake this extra work, since I otherwise shall be unable to reconsider the paper.