| 单词 | Upper Carboniferous period |
| 释义 | Upper Carboniferous period (extremely rare) n WORD FAMILY Upper Carboniferous period n from 310 million to 280 million years ago; warm climate; swampy land Syn|Exp Pennsylvanian, Pennsylvanian period, Upper Carboniferous geological period, period a unit of geological time during which a system of rocks formed |
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