Before this activity, I interviewed my classmates of mine.
在这次活动之前，我还采访了我们班的同学。
The groundwater activity of the mining area is always major research of the mine environment.
矿山地下水运动一直是矿山环境问题的研究重点。
The groundwater activity of the mining area is always major research of the mine environment.
矿山地下水运动一直是矿山环境问题的研究重点。
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