without fail不是想当然的“没有失败”的意思，其含义如下：
without fail (用以强调命令或承诺，或经常性的动作)一定，必须， 务必；总是，一直，必定
相当于must或always
On the 30th you must without fail hand in some money for Alex
30日那天你必须替亚历克斯交一些钱。
Take the money to your office without fail, first thing in the morning.
早上第一件事是一定要把钱拿到办公室去。
Tomorrow without fail he would be at the old riverside warehouse.
明天他一定会在河边的旧仓库里。
He attended every meeting without fail.
他逢会必到。以上四例摘自《柯林斯高阶英汉双解学习词典》
We will fulfil the quota without fail.
完成生产指标不成问题。《汉英大词典》
fulfil [fʊlˈfɪl]
vt.完成;履行;实现;符合;执行;具备;起…作用;目的是;使高兴
quota [ˈkwəʊtə] n.定额;配额;限额;指标;定量;(候选人当选所需的)规定票数，最低票数
I'll be there at two o'clock without fail.
我两点钟一定到那里。
I go to the gym every Monday and Wednesday, without fail.
我每周一和周三必定去健身房。
Be there at nine o'clock, without fail.
9点钟务必到那里。
I’ll be there at noon without fail.
我中午必定会到那里。
I want you here by two o'clock without fail.
我要你两点钟务必来到这里。
He emails every week without fail.
他每周必定发电子邮件。
She rings every day without fail.
她每天必定打来电话。
The plane leaves on time every day without fail.
飞机每天总是准时离开。
I have passed the same woman walking her dog every day without fail for five years—but today she wasn't there. I'm really worried about her!
这五年来，我每天路过必定会看到同一个女人在遛狗。但是今天她不在那儿，我非常担心她。
That check will arrive tomorrow morning without fail.
托运的行李明早一定会到。
You must finish it by six without fail.
你必须6点以前完成，不得有误。