单词：system of mining
system of mining的用法和样例：
例句
- At last, some suggestions were raised for the concrete backfill mining.最后对具体的充填开采方法提出了建议。
- While strip mining is most suitable for level areas, a method has also been devised for working in hilly regions.如果说剥离开采最适用于平缓的地形的话，那么对山坡地形的开采也设计有一种开采方法。
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