单词	black swan
释义	black swanˌblack ˈswan (also ˌblack ˈswan eˌvent) noun [countable] an event that no one expects and that has a very great effect
随便看	piety piffle piffling pig pigeon pigeon-chested pigeonhole pigeon-toed piggery Piggott, Lester Piggy piggy piggyback piggybacking piggy-bank pigheaded pigheadedness pig iron Piglet piglet pigment pigmentation pigmy Pigpen pigpen

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