Another miner who had worked in a section affected by the explosion said methane levels frequently set off detectors, forcing the automatic shutdown of a coal-cuttingmachine.
谁曾在另一个受爆炸影响的部分工作的矿工说,甲烷水平经常掀起探测器,迫使煤炭切割机自动关机。
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They work with remote control devices that change the direction, position and speed of a German-made cuttingmachine that slices back and forth along a 300-metre-wide coal face.