英语词汇“active layer”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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active layer

active layer n. Geomorphology a surface layer of soil, overlying permafrost, that freezes in winter and thaws in summer.

ΚΠ

1943 S. W. Muller Permafrost 5 Above the permafrost is a layer of ground that thaws in the summer and freezes again in the winter. This layer represents the seasonally frozen ground and is called the active layer.

1977 A. Hallam Planet Earth 89 The churning of the active layer by freezing and thawing prevents the development of a stable soil structure.

2005 New Yorker 25 Apr. 61/1 When you walk around in the Arctic, you are stepping not on permafrost but on something called the ‘active layer’.

extracted from activeadj.n.

as lemmas

单词	active layer
释义	> as lemmas active layer active layer n. Geomorphology a surface layer of soil, overlying permafrost, that freezes in winter and thaws in summer. ΚΠ 1943 S. W. Muller Permafrost 5 Above the permafrost is a layer of ground that thaws in the summer and freezes again in the winter. This layer represents the seasonally frozen ground and is called the active layer. 1977 A. Hallam Planet Earth 89 The churning of the active layer by freezing and thawing prevents the development of a stable soil structure. 2005 New Yorker 25 Apr. 61/1 When you walk around in the Arctic, you are stepping not on permafrost but on something called the ‘active layer’. extracted from activeadj.n. < as lemmas
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