What done is

what is done is done what's done is done What done is What is done is done.是什么结构? what's done is done 是什么意思呀 ? what is to be done? Accept what is done is done 怎么翻译 What is done can not be ______________ you can't undo what is done. what is done can't be undone what is done cannot be undone是什么意思 What is done cannot be _____.