irreversible 不可逆转的
irrevocable 不可撤销的
部分单词例句：
Limited resources and increasing the frequency of user needs into a conflict of irreconcilable.
有限的频率资源和日益增长的用户需求成为一种不可调和的'矛盾。
Development is an absolute principle and it is an irrefutable fact also.
发展才是硬道理，这是不争的事实。
He is faced with the fact of an irremediable marital breakdown.
他面临着不可挽救的婚姻破裂的事实。
Or was it his irrepressible sense of humour rising above circumstances?