“paleo-permafrost”的概念、定义、翻译、参考文献-科学参考

单词	paleo-permafrost
释义	paleo-permafrost Encyclopedia 理学〔第四纪沉积记录〕释 paleo-permafrost古冻土过去冻结，现已完全融化的土层。又称古多年冻土。
随便看	closed extension closed family of sets closed field closed filament closed filter closed fishing areas closed fishing season closed-flux device closed fork mounting closed form closed-form number closed-form solution closed formula closed fuel cycle closed function closed geodesic closed graph closed-graph mapping closed graph theorem closed-graph theorem closed grill closed ground field closed group closed half-line closed half-plane

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