审稿人意见：There is already literature report of preparation of all three polymorphs of CaCO3 without the use of any additive. The authors need to go through such papers.
引用文献 三种晶型不添加任何添加剂可以制备三种晶型calcite方解石, aragonite文石 and vaterite球霰石，
是理解为：不添加添加剂制备三种晶型混合的碳酸钙，还是不添加添加剂制备任意一种晶型混合的碳酸钙
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