adj.不可撤销的，无法改变的，不可更改的

The marriage contract is irrevocable once signed, meaning there's no going back.
一旦签订婚约，就无法撤销，意味着没有回头路。
His decision to quit his job is an irrevocable one; he won't change his mind.
他辞职的决定是不可更改的，他不会改变主意。
An irrevocable trust is established for the beneficiary's lifetime, ensuring their financial security.
为受益人设立了终身不可撤销的信托，以确保他们的经济安全。
She made an irrevocable commitment to donate her organs after death.
她已做出不可撤回的承诺，死后捐赠器官。
The company's board has made an irrevocable decision to close down the plant.
公司董事会已做出不可更改的决定关闭工厂。
The will was declared irrevocable, leaving no room for contestation.
遗嘱被宣布为不可撤销的，不容置疑。
He has signed an irrevocable lease on the apartment, so he can't back out now.
他已经签订了不可撤销的租房合同，现在不能反悔了。
The government's policy on climate change is an irrevocable commitment to reducing carbon emissions.
政府关于气候变化的政策是对减少碳排放的不可更改的承诺。
She made an irrevocable promise to support her child's education.
她已经做出了对子女教育的不可撤回的承诺。
His passport application was rejected as final and irrevocable.
他的护照申请被拒绝，且决定是最终且不可更改的。