我国尾矿库安全状况令人担忧。

The safety situation of tailing pond in China is alarming.

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但近年来，尾矿库回水质量有逐年恶化的趋势。

However the backwater quality is worsening increasingly in recent years.

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但近年来，尾矿库回水质量有逐年恶化的趋势。

However the backwater quality is worsening increasingly in recent years.

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