不可改变地 meaning in English

unalterably

My task was a very hard one ; but , as i was absolutely resolved - as my cousins saw at length that my mind was really and immutably fixed on making a just division of the property - as they must in their own hearts have felt the equity of the intention ; and must , besides , have been innately conscious that in my place they would have done precisely what i wished to do - they yielded at length so far as to consent to put the affair to arbitration
我的任务很艰巨，但是因为我下定了决心我的表兄妹们最后看到，我要公平地平分财产的想法已经真的不可改变地定了下来还因为他们在内心一定感到这种想法是公平的，此外，也一定本来就意识到他们如处在我的地位，也一样会做我希望做的事最后他们让步了，同意把事情交付公断。