单词	de rigueur
释义	de rigueurde ri‧gueur /də riːˈɡɜː $ -ˈɡɜːr/ adjective [not before noun] Word Origin WORD ORIGINde rigueur Origin: 1800-1900 French ‘of strictness’ Examples EXAMPLES FROM OTHER DICTIONARIES Tuxedos are de rigueur at the event. considered to be necessary if you want to be accepted, fashionable etc – used humorously:  the gleaming white teeth that are de rigueur for movie stars
随便看	island islander Islay isle Isle of Dogs Isle of Man Isle of Wight islet Islington ism -ism isn't ISO iso- isobar isolate isolated isolation isolationism isolationist Isolde isometrics isosceles triangle isotherm isotonic drink

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