| 单词 | active layer |
| 释义 | active layernoun Geography The seasonally thawed surface layer above permafrost.A bear can dig an entrance in a peat bank up to 120 cm deep by digging through the active layer into the permafrost and then digging to excavate the main body of the den....
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英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。