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	stamp duty stamped addressed envelope stampede stamping ground stance stanch stanchion stand standalone standard standard-bearer standard deviation Standard Grade Standard grade standard-issue standardization standardize standard lamp standard of living Standard Oil Standard, The standard time standby standby time stand-in

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