(a) a river and its tributaries, considered as a unit; (in early use also) a group of connected rivers and streams (rare); (b) Zoology = water-vascu…
| 单词 | θ2850 | 
| 释义 | the world > the earth > water > rivers and streams > system > 			[noun]		 (144)		 water system1833 (a) a river and its tributaries, considered as a unit; (in early use also) a group of connected rivers and streams (rare); (b) Zoology = water-vascu… river system1834 a large river and its tributaries considered as a single entity. Subcategories:— 			natural drainage			(8)		 — 			flow			(3)		 — 			run-off			(1)		 — 			course			(10)		 — 			descent			(1)		 — 			surface			(1)		 — 			head or source			(22)		 — 			mouth or outfall			(28)		 — 			broad part			(1)		 — 			narrow part			(2)		 — 			shallow part			(4)		 — 			still part			(6)		 — 			bend			(10)		 — 			reach			(3)		 — 			stretch of broken water			(2)		 — 			pool as part of			(12)		 — 			rapids			(11)		 — 			part for fishing			(4)		 — 			having no trout			(1)		 — 			place where rivers meet			(6)		 — 			river-bed			(6)		  | 
	
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