| 单词 | mat packs |
| 释义 | mat packs [`mat ´paks] MINING ENGINEERING Timbers laid side by side into a solid mass 2 by 21/2 feet (61 by 76 centimeters) square and 4-6 inches (10-15 centimeters) thick, kept together by wires through holes drilled through the edges of the mass, carried into a mine and built up to make effective roof supports. |
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