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单词 a leap up
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a leap up
6. Mining. A fault or dislocation of strata. a leap up or leap down, one caused by upheaval or sinking of the strata.
ΚΠ
1747 W. Hooson Miners Dict. sig. L3 Leap..is when the Vein is thrown of from its perpendicular Course, at once into the Side; these Leaps never happen, but at some Way-board, or large Bed-joynt.
1855 J. R. Leifchild Cornwall: Mines & Miners 109 Vertical Intersections.—These are commonly called leaps, or throws.
1874 J. H. Collins Princ. Metal Mining (1875) Gloss. 136/2 at Fault. If [the displacement of strata is] upwards, a leap or upthrow; if downwards, a slide or downthrow.
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更新时间:2024/12/23 20:17:12