Recently siblings are discussing problems such as the safety of the earth ecosystem, how much mineral resource human can make use?
最近，兄弟姐妹们在议论地球生态系统的安全问题，人类可利用的矿物资源还有多少？
Recently siblings are discussing problems such as the safety of the earth ecosystem, how much mineral resource human can make use?
最近，兄弟姐妹们在议论地球生态系统的安全问题，人类可利用的矿物资源还有多少？
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