| 单词 | top-head |
| 释义 | > as lemmastop-head top-head n. Mining see quot.ⓘ ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > passage > for escape or draining of gas blower1822 piper1883 top-head1883 1883 W. S. Gresley Gloss. Terms Coal Mining Top Heads (S.S.), passages driven in the upper part of the Thick coal for draining off the gas. < as lemmas |
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