black swanˌblack ˈswan (also ˌblack ˈswan eˌvent) noun [countable] 
an event that no one expects and that has a very great effect
an event that no one expects and that has a very great effect
| 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 |
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