| 单词 | top wall |
| 释义 | > as lemmastop wall top wall n. Mining see quot.ⓘ ΘΚΠ the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material above hanger1631 grass1672 overburden1821 top wall1881 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 144 Hanging-side or Hanging-wall, or Hanger, Corn[wall]. The wall or side over the vein... Top-wall. See Hanging-wall. < as lemmas |
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