Remember, black swan is this rare bird that you see once and suddenly shattered your belief that all swans should be white, so it has captured the idea of unpredictability, unknowability, that the extreme events are fundamentally unknowable.
要知道，黑天鹅是一种罕见的鸟类， 而你只要看见它一次， 就会彻底改变你“所有天鹅都是白色的”看法。 这就是不可预测，不可获知性， 即极端事件是我们完全无法获知的。