A system of drains, artificial or natural.
| 单词 | θ2851 | 
| 释义 | the world > the earth > water > rivers and streams > system > 			[noun]		 > natural drainage (8)		 drainage1877 A system of drains, artificial or natural. Subcategories:— 			forming of spec.			(1)		 — 			specific river profile			(6)		 | 
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