improbability
n
(a) [U] state of being improbable 不大可能; 未必能发生
the improbablity of his being recaptured 对他再行拘捕之不大可能.
(b) [C] event that is improbable 不大可能的事; 未必能发生的事
Don´t worry about such improbabilities as floods and earthquakes. 像洪水、 地震这类不大可能发生的事, 就不要担心了.