n.可变更性；可更改性
No one can alter the fact, ex post facto. 没有人能在事后改变事实本身。
He's my alter ego, we go everywhere together. 他是我的知己--彼此形影不离。
She had to alter her clothes after losing weight. 她瘦了以後，衣服也得修改了。
But nothing can alter the facts. 但任何东西也改变不了这些事实。
Environment can sometimes alter the rut age of an animal. 有时环境可以改变动物发情的年龄。
I'll have to alter the diagram. I've made a mistake. 我得修改图表。我出了点儿错。
