中文翻译与英英解释 | 【地质学；地理学】标准层。
| | | key: n. 礁，暗礁(＝cay, quay)。 | | bed: n. 1.床，床铺；床位，铺；(动物的)窝；〔比喻〕安乐 ... | |
| In geology, a key bed (syn marker bed) is a relatively thin layer of sedimentary rock that is readily recognized of the basis of either its distinct physical characteristics or fossil content and can be mapped over a very large geographic area.Neuendorf, K. |
例句与用法 | 1. | Study on the key bed theory of roof supporting in stope
采场支撑顶板关键层理论的研究
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