improbability
n
(a) [U] state of being improbable 不大可能; 未必能發生
the improbablity of his being recaptured 對他再行拘捕之不大可能.
(b) [C] event that is improbable 不大可能的事; 未必能發生的事
Don't worry about such improbabilities as floods and earthquakes. 像洪水、 地震這類不大可能發生的事, 就不要擔心了.