Though a few people can remember one thousand new words a day, they can't remember them once for all.

可能有个别人能在一天之内记忆一千个单词，但是，他们无法一劳永逸地记住这些单词。

I refused him once for all.

我坚决彻底地拒绝了他。

I can't remember them once for all.

我不可能一劳永逸地记住它们。

You may leave at once for all I care.

你尽可立即离开，我才不管呢。

We have solved this problem once for all.

我们已经一劳永逸地解决了这个问题。