| 单词 | half course |
| 释义 | > as lemmashalf course half course n. Mining now rare a direction within a seam at about 45 degrees to the course (course n.1 13b). Π 1852 Illustr. London News 29 May 428/2 The drifts proceeding on the half course to the dip at this point are those penetrating the furthest into the deep unworked coal measures by which this colliery is bounded. 1959 T. A. Jones Rep. H.M. Inspectors Mines & Quarries 1958 South Western Div. i. 9 Three men were asphyxiated in an outburst of gas and coal which came from the high rib side corner of a 45-yard-long development face advancing at half course to the full dip. < as lemmas |
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