| 单词 | seat-earth |
| 释义 | > as lemmasseat-earth seat-earth n. one of the various names applied to the bed underlying a coal-seam. ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > strata underlying a coal-seam seat1867 seat-earth1877 seat-stone1878 1877 T. H. Huxley Physiography 236 Each bed of coal is supported by a layer of shale known as under-clay or seat-earth. < as lemmas |
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