| 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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