| 单词 | dip-head |
| 释义 | > as lemmasdip-head dip-head n. a heading driven to the dip in a coal-mine in which the beds have a steep inclination; whence dip-head level. ΚΠ 1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) III. 326 Were the coal-field an entire elliptical basin, the dip-head levels carried from any point would be elliptical. 1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) III. 328 It is, moreover, proper to make the first set of pillars next the dip-head much stronger. < as lemmas |
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