单词	valve
释义	valvevalve /vælv/ ●○○ noun [countable] Etymology ETYMOLOGYvalve Origin: 1400-1500 Latin valva part of a door 1 a part of a tube or pipe that opens and shuts like a door to control the flow of liquid, gas, air, etc. passing through it2science, biology a part of an artery or vein that folds or closes in order to stop blood flowing back where it came from3eng. lang. arts the part on a trumpet or similar musical instrument that you press to change the sound of the note [Origin: 1400–1500 Latin valva part of a door] → see also bivalve, safety valve
随便看	uppity upraised upright uprightness upright piano uprising upriver uproar uproarious uproariously uproot upscale upset upsetting upshot upside upside down upsilon upstage upstairs upstanding upstart upstate upstream upsurge

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