生物丰度指数提高了10.43，说明南京市区生物丰富程度有很大改观；
Moreover, biological abundance index increases by 10.43, indicating that the biological diversity changes a lot positively during four years.
生物丰度指数提高了10.43，说明南京市区生物丰富程度有很大改观；
Moreover, biological abundance index increases by 10.43, indicating that the biological diversity changes a lot positively during four years.
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