| 单词 | key bed |
| 释义 | > as lemmaskey bed key bed n. (a) Mechanics = keyway n. (a) (now rare); (b) Geology = marker bed n. (a) at marker n. Compounds 2. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > shaft > [noun] > parts of > key > part on which key rests key bed1835 key seat1843 1835 Repertory Patent Inventions 4 324 On this projecting part is a longitudinal rib or key fitting into a key bed. 1903 Jrnl. Geol. (Chicago) 11 764 After its stratigraphic position has been definitely fixed in a number of exposures, it becomes a key bed to the whole series. 1923 Locomotive Apr. 165 The key was fitted so that it pressed hard on the top of the key bed in the coupling. 1967 Jrnl. Paleontol. 41 176/2 Successful correlation of the Gray-red bentonite bed would establish a most helpful key bed in interpreting the biofacies. 2007 G. R. Thompson & J. Turk Earth Sci. & Environment (ed. 4) iv. 84/1 The thin, sooty, iridium-rich clay layer deposited 65 million years ago from debris of a giant meteorite impact..is a classic example of a key bed. < as lemmas |
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