求翻译：根据井田煤层赋存情况和有利的地形条件，矿井采用平硐—斜井开拓，矿井设置四个阶段，两个开采水平和一个辅助水平，开采水平标高分别为+1500m、+1200m、1800辅助水平。是什么意思？

Ida coal seam and the favorable terrain conditions, mine adit - inclined to explore, mine is set in four phases, two mining level and a secondary level, the mining level elevation of +1500 m, +1200 m, 1800 secondary level .

Coal mine field that is based on and favorable terrain, mine has a flat Outline - Explore, mine, set 4 Phase Two mining level and a secondary level, the exploitation level elevation, + 1500 + 1200 M, 1800 M, and secondary levels.

Saves the situation and the advantageous topographical condition according to the well field coal bed tax, the mine pit uses the even mountain cave - slant hole development, the mine pit establishes four stages, two mining levels and an auxiliary level, the mining horizontal elevation respectively i

According to mine coal seam hosting and favourable terrain conditions, mine adit-inclined shaft development, mine set four stages, two mining and a secondary level, mining level elevation +1500m, +1200m, 1800 secondary levels respectively.

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