longwall remaining coal pillars support mining
长壁残余煤柱支撑开采
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The key technology of longwall remaining coal pillars support mining is to distinguish two kinds of coal pillars of different character between regional coal pillar and isolated coal pillar.
长壁留煤柱支撑法开采的关键技术是区分两类不同性质的煤柱，即区内煤柱和区域间的隔离煤柱。
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