Letseng is one of the most productive mines in history — four of the world's 20 largest rough diamonds have been found at the mine, including the three largest found this century.
Needless to say, the farm the first farmer had sold, so that he could search for a diamond mine, turned out to be the most productive diamond mine on the entire African continent.
不必说，第一个农民为了搜寻钻矿而卖掉的农场结果却是整个非洲大陆上最多产的钻矿。
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Mine hoist is the throat and life lines of mine. That its performance is safety or not will not only effect the productive efficiency but also bring some serious societal impact.