石油储存位置很深，大约海平面以下4英里，但是专家表示，还是可以采取措施进行开采的。
The oil is in a great depth, some 4 miles below the ocean's surface, but experts say, it is recoverable.
传统的露天矿开采境界为固定帮有台阶、露天底平面型。
Traditional open-pit mining boundary features fixed slope with benches and planar bottom.
地下开采煤层的分布形式多种多样，平面分布仅是曲面分布形式中的一种简单情况。
The distribution patterns of underground coal seam is diversified. The plane distribution is only one of the simple curved surface distribution patterns.
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