irreversible 不可逆轉的
irrevocable 不可撤銷的
部分單詞例句：
Limited resources and increasing the frequency of user needs into a conflict of irreconcilable.
有限的頻率資源和日益增長的用戶需求成為一種不可調和的矛盾。
Development is an absolute principle and it is an irrefutable fact also.
發展才是硬道理，這是不爭的事實。
He is faced with the fact of an irremediable marital breakdown.
他面臨著不可挽救的婚姻破裂的事實。
Or was it his irrepressible sense of humour rising above circumstances?
還是在危險環境中他依然有抑制不信的幽默感？