Hi 南安南洋南昌,
Thank you for reaching out to me. I am not clear on the issue you are commenting on so it would be very helpful if you could provide further information to provide that clarity.  The edit I made was to convert this polygon from a multipolygon to a simple polygon and removed the relation.  I also added the natural=water tag because as per wiki guideline the single member shouldn't be in multipoloygon relation. 

I look forward to hearing back from you.