Employment in U. S. coal mines has been falling for decades, pushed more by market forces than environmental policy.
几十年来，美国煤矿的雇佣人数一直在下降，这更多是由市场力量推动，而非环境政策。
Compared with other industries, mine cleaner production has obviously more difficulties and lags behind. It "s imperative to develop demonstration research on cleaner production of mines."
与其他行业相比，矿山清洁生产难度大且明显滞后，开展矿山清洁生产示范研究势在必行。
Since the technology of mixed and charged emulsion explosive truck was introduced into China by the Ministry of Metallurgical Industry in early 80's, it has been only used in mines.
我国自80年代初由冶金部引进炸药混装车技术以来，一直仅限于矿山使用。
There is some effort to reopen rare earth mines in the U. S but I don't know how viable they can be for the long run and even with them China's a hard supplier to replace.
美国的确有些稀土矿重开的努力，但我不知道他们是否能够长期开采，即便有他们，中国也是一个很难替代的供应者。
In 1936, the U. S. Bureau of Mines took control and started digging.
在1936年，美国采矿办公署进驻而开始挖掘。
Forecast of first-class time parameters such as truck "s travel time and shovel" s loading time is an important problem for truck dispatching system in open-pit mines.
道路运行时间、电铲装车时间等一类时间参数的预测是露天矿卡车调度系统中的一个重要问题。
Forecast of first-class time parameters such as truck "s travel time and shovel" s loading time is an important problem for truck dispatching system in open-pit mines.
道路运行时间、电铲装车时间等一类时间参数的预测是露天矿卡车调度系统中的一个重要问题。
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