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    9.        to help restore aquatic ecosystems harmed from over-extraction. (recycle)

    回收利用的废水也可以用于帮助恢复被过分压搾而受伤害的水中的生态系统。

    9.Recycled wastewater can also be used

    题目来源：丢分题高中英语高二上 > Unit 3 Life in the future

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