fully mechanized top coal caving mining face的用法和樣例：
例句
At the same time, methane effusing from the coal seam being worked increases, and the emphases of methane control could be put on the methane effusing from coal seam being worked. 而大采長綜放工作面本煤層瓦斯湧出量增大，則需要增加通風量或者採用新的通風方式。
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