1. without fail : 务必, 必定；
及物动词
1. fail
1. When I wanted his help he failed me.
当我需要他帮助时，他却使我失望。
2. His courage failed him.
他失去了勇气。
不及物动词
1. Our plan has failed.
我们的计划失败了。
2. He never fails to write to his mother every week.
他从来没有忘记每周给母亲写信。
3. fail
3. Last year the crops failed.
去年农作物歉收。
1. 不及格：2005年7月,教师职业协会针对一个议题展开讨论--"不及格"(fail)是否应该从教育字汇中删除,并用"成就延期"(deferred success)来替代?之所以会有这个议题,是因为有些人认为学生们会因为考试屡次不及格而降低学习兴趣.
2. 错误：Fluke4000测试自动与标准进行比较,并且显示通过(Pass)或错误(Fail)信息,同时有声音提示,用RS-232打印出报告. (15) 简易综合布线测量仪,用于测量UTP双绞线. 系统测试在测试小组开展,在测试环境中实施,由测试经理统一负责.
3. 故障：成本差异:CMOS应用半导体工业常用的MOS制程,可以一次整合全部周边设施于单晶片中,节省加工晶片所需负担的成本和良率的损失;相对地CCD采用电荷传递的方式输出资讯,必须另辟传输通道,如果通道中有一个像素故障(Fail),就会导致一整排的讯号壅塞,
1. 失败;未能够;未做成
If you fail to do something that you were trying to do, you are unable to do it or do not succeed in doing it.
e.g. The Workers' Party failed to win a single governorship...
劳工党连一个州长职位也未能赢得。
e.g. He failed in his attempt to take control of the company...
他试图掌控公司，但以失败告终。
2. (活动、尝试、计划等)失败，不成功
If an activity, attempt, or plan fails, it is not successful.
e.g. We tried to develop plans for them to get along, which all failed miserably...
我们试图计划让他们好好相处，但均以惨败告终。
e.g. He was afraid the revolution they had started would fail...
他担心他们发起的大变革会遭遇失败。
3. 没有做，未做(应做的事)
If someone or something fails to do a particular thing that they should have done, they do not do it.
e.g. Some schools fail to set any homework...
有些学校没有布置任何作业。
e.g. He failed to file tax returns for 1982...
他没有呈报 1982 年的纳税申报单。
4. 出故障;失灵
If something fails, it stops working properly, or does not do what it is supposed to do.
e.g. The lights mysteriously failed, and we stumbled around in complete darkness...
灯不知怎么地不亮了，我们在一片黑暗中跌跌撞撞地走着。
e.g. In fact many food crops failed because of the drought.
实际上，因为干旱，很多粮食作物歉收。
5. (企业)倒闭，破产;(机构)解体;(体系)崩溃
If a business, organization, or system fails, it becomes unable to continue in operation or in existence.
e.g. So far this year, 104 banks have failed.
今年到目前为止，已有 104 家银行倒闭。
e.g. ...a failed hotel business...
破产的酒店
6. (健康状况、体质等)衰弱，虚弱，衰退
If something such as your health or a physical quality is failing, it is becoming gradually weaker or less effective.
e.g. He was 58, and his health was failing rapidly...
他 58 岁，身体正在迅速衰老。
e.g. Here in the hills, the light failed more quickly...
在山区这儿，天黑得更快。
7. 辜负;使失望
If someone fails you, they do not do what you had expected or trusted them to do.
e.g. We waited twenty-one years, don't fail us now.
我们等了 21 年了，如今不要让我们失望。
e.g. ...communities who feel that the political system has failed them.
对此套政治体制感到失望的群体
8. 不履行，未尽(职责)
If someone fails in their duty or fails in their responsibilities, they do not do everything that they have a duty or a responsibility to do.
e.g. Lawyers are accused of failing in their duties to advise clients of their rights...
律师们被控未尽到告知当事人其正当权利的职责。
e.g. If we did not report what was happening in the country, we would be failing in our duty.
如果我们没有报道这个国家正在发生的事情，我们就没有尽到自己的责任。
9. (品质或能力)有负于;(使)不如愿;不够
If a quality or ability that you have fails you, or if it fails, it is not good enough in a particular situation to enable you to do what you want to do.
e.g. For once, the artist's fertile imagination failed him...
这位画家丰富的想象力曾一度枯竭。
e.g. Their courage failed a few steps short and they came running back.
还差几步他们却胆怯了，又跑回来了。
10. 不及格
If someone fails a test, examination, or course, they perform badly in it and do not reach the standard that is required.
fail的意思
e.g. I lived in fear of failing my end-of-term exams.
我总是担心期末考试不及格。
11. 评定…不及格;使不及格
If someone fails you in a test, examination, or course, they judge that you have not reached a high enough standard in it.
e.g. ...the two men who had failed him during his first year of law school.
在法学院一年级时让他不及格的两个人
12. 如果其他一切都不奏效的话;假如其他都行不通
You say if all else fails to suggest what could be done in a certain situation if all the other things you have tried are unsuccessful.
e.g. If all else fails, I could always drive a truck.
如果其他都不行，我总还可以开卡车。
13. (用以表示不赞成)不明白，看不出
You can use I fail to see or I fail to understand in order to introduce a statement which indicates that you do not agree with what someone has said or done.
fail在线翻译
e.g. That's how it was in my day and I fail to see why it should be different now.
我那时候就是这样的，我搞不懂为什么现在非要弄得不一样。
14. 总是;一直
You use without fail to emphasize that something always happens.
fail的反义词
e.g. He attended every meeting without fail.
他逢会必到。
15. (用以强调命令或承诺)一定，必须
You use without fail to emphasize an order or a promise.
e.g. 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。
e.g. 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。