... mine track devices 矿山轨道运输安全装置 mine tractor 矿用拖拉机 mine velocity head 矿井通风速度压头 ...
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I did a lot of jobs back at that time in the society: Washing dishes, driving tractor, selling small goods like pants and socks and even working in the coal mine.
我那时在社会上做了很多工作：洗盘子，开拖拉机，卖袜子、裤子等小商品，甚至在煤矿做矿工。
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