单词	raison d'être
释义	raison d'êtrerai‧son d'être /ˌreɪzɒn ˈdetrə $ -zoʊn-/ noun [singular] Word Origin WORD ORIGINraison d'être Origin: 1800-1900 French ‘reason of being’ the reason why something exists, why someone does something etc:  Commerce was the town’s raison d'être.
随便看	on-message o.n.o. on-off onomatopoeia onomatopoeic Ono, Yoko on-ramp onrush onrushing on-screen onset onshore onside on-site onslaught onstage on stream Ontario Ontario, Lake on-the-job On the Origin of Species On the Road on-the-spot onto ontological

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