without fail

without fail

必定, 一定

例句与用法：

He wants you to see him in London without fail.

他要你去伦敦看他，不得有误。

Be here at noon without fail.

一定在正午时到这里

I'll be there at two o'clock without fail.

我两点钟一定到那里。

He said he would go fishing without fail.

他说他一定会去钓鱼的。

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必定

I shall bring you your mail without fail.

我一定把你的信带来给你。