爷爷在矿上做工时受了背伤，结果，他在轮椅上度过了他的余生。
Grandfather had sustained a broken back while working in the mines. Consequently, he spent the rest of his life in a wheelchair.
到矿上参观的人必须遵守规章。
矿上医生每天巡诊。
The doctors at the mine make their rounds of visits every day.
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