| 单词 | Pennsylvanian period |
| 释义 | Pennsylvanian period (once / 11819311 pages) n WORD FAMILY Pennsylvanian period n from 310 million to 280 million years ago; warm climate; swampy land Syn|Exp Pennsylvanian, Upper Carboniferous, Upper Carboniferous period geological period, period a unit of geological time during which a system of rocks formed |
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