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13.58.200.16

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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 holing
 打眼; 掏槽落煤法

From: Webster's Revised Unabridged Dictionary (1913)

 Hol·ing n.  Mining Undercutting in a bed of coal, in order to bring down the upper mass.