Each of the portions into which the atmosphere or (in later use) the sea is notionally divided according to height or depth.
| 单词 | θ75302 | 
| 释义 | the world > matter > gas > air > 			[noun]		 > air above our heads > portion of (4)		 regiona1398 Each of the portions into which the atmosphere or (in later use) the sea is notionally divided according to height or depth. Subcategories:— 			specific			(2)		 — 			layer adjacent to moving body			(1)		 | 
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