system of mining的用法和樣例：
例句
- At last, some suggestions were raised for the concrete backfill mining.
最后對具體的充填開(kāi)采方法提出了建議。 - While strip mining is most suitable for level areas, a method has also been devised for working in hilly regions.
如果說(shuō)剝離開(kāi)采最適用于平緩的地形的話(huà)，那么對山坡地形的開(kāi)采也設計有一種開(kāi)采方法。
