单词	valley
释义	valleyvalley /ˈvæli/ ●●● S3 W2 noun (plural valleys) [countable] Etymology ETYMOLOGYvalley Origin: 1200-1300 Old French valee, from val earth science, geography an area of lower land between two lines of hills or mountains, usually with a river flowing through it:  the Mississippi River valley [Origin: 1200–1300 Old French valee, from val]
随便看	underworld underwrite underwriter undeserved undesirable undesirables undetectable undetected undetermined undeterred undeveloped undid undies undiluted undiminished undisciplined undisclosed undisguised undisputed undistinguished undisturbed undivided undo undocumented undoing

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