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1·He emails every week without fail.

他每周必定发电子邮件。《牛津词典》

2·I want you here by two o'clock without fail.

我要你两点钟务必来到这里。《牛津词典》

3·On the 30th you must without fail hand in some money for Alex.

在30号你务必亲手交给亚历克斯一些钱。《柯林斯英汉双解大词典》

4·This is one example that, without fail, people would say is a marvel of medicine and bioengineering, but that it's still something to keep track of.

这是一个例子，毫无疑问，人们会说这是医学和生物工程的奇迹，但它仍然是值得关注的。

5·He attended every meeting without fail.

他逢会必参加。《柯林斯英汉双解大词典》

6·I'll be back in one hour without fail, answered the Marionette.

“我一小时后一定回来。”木偶回答说。

7·Please quote your folio number without fail.

请务必提供您的页码编号。

8·He calls me every Sunday night without fail.

他每个星期天的晚上必定会给我打电话。

9·You can count on me; I'll be there without fail.

你可以仰仗我，我一定会去那的。

10·I want that work finished by tomorrow, without fail.

我要求那项工作在明天前完成，不得有误！

必定

1·He emails every week without fail.

他每周必定发电子邮件。《牛津词典》

2·He calls me every Sunday night without fail.

他每个星期天的晚上必定会给我打电话。

务必

1·I want you here by two o'clock without fail.

我要你两点钟务必来到这里。《牛津词典》