Further complicating this issue is the need to maintain healthy aquatic ecosystems. 更為復雜的問題在于保持健康的水生生態系統的需要。
The result showed that the pollution of the waterbody exerted agreat disadvantageous effect to the Haihe River ecosystem. 結果表明，水體污染已經對海河水生生態系統產生了明顯的有害影響。
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