| 单词 | metal ridge |
| 释义 | > as lemmasmetal ridge ΚΠ 1829 J. Buddle in Evid. State Coal Trade 8 The next stage is when the crack is completed, and it assumes the shape of a metal ridge. The next is when the metal ridge reaches the roof. 1883 W. S. Gresley Gloss. Terms Coal Mining Metal ridges, pillars forming themselves into supports to the roof, formed by the creep in the boards. < as lemmas |
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