单词	protoptile
释义	protoptile noun pro·​top·​tile (ˈ)prō¦täptə̇l plural -s : one of the first set of down feathers in young birds having two sets of down Word History Etymology prot- + -ptile
随便看	originatively originator originators originist origins orihon Orillia orillion orillions orillon orinasal orinasals orinoci Orinoco Orinoco crocodile orinocoes orinocos oriole orioles orioli Oriolidae oriolidaes orioluses oriolusses orion

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