求翻译：三、采煤方法设计。本矿采用综合机械化采煤，综采面长170m，日进6刀，本矿井田共分为6个采区，矿井采用走向长壁后退式采煤法，全部垮落法管理顶板。是什么意思？

Third, the design of mining methods. Integrated mechanized mining of this ore, fully mechanized mining face length of 170m, into the six knives, the Mine Field is divided into six mining area, mine Retreat Longwall mining method, all Management roof caving method.

3, coal mining methods. The introduction of the integrated mechanized mining coal, mining, and the long, 170 M to 6 knife, the mines, for a total of 6 parklands with mine back toward long-wall Mining Law, all fall down roof management law.

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Third, the design of mining method. The mine fully mechanized coal mining, long 170m in fully-mechanized mining face today, 6 knives, the mine is divided into 6 district, mine-longwall retreat mining, all caving law of roof.

Third, mining coal methods design.This ore uses synthesis mechanization mining coal, the synthesis picks face length 170m, the date enters 6 knives, this mine pit field altogether divides into 6 to pick the area, the mine pit uses moves towards the long wall backlash type mining coal law, breaks dow