without fail
collocation必定；一定
She visits her parents every Sunday without fail.
她每个星期天必定去看望父母。
失败
先理解核心含义，再看它在真实句子里的用法。
失败
a failure, especially of a financial transaction
I got a fail in my math test, so I have to take it again.
我数学测验得了个不及格，所以得重考。
失败,尤指金融交易失败(行动终止)
A failure, especially of a financial transaction (a termination of an action).
从草地切下的一块草皮
A piece of turf cut from grassland.
考试不及格的成绩
A failing grade in an academic examination.
His report card shows three fails and two passes this term.
这学期他的成绩单上有三个不及格和两个及格。
She was afraid of getting a fail on the driving test, but she passed.
她担心驾照考试不及格，但最后还是通过了。
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必定；一定
She visits her parents every Sunday without fail.
她每个星期天必定去看望父母。
惨败；彻底的失败
The product launch was an epic fail.
这次产品发布会彻底失败了。
及格或不及格
The course is graded pass or fail.
这门课只算及格或不及格。
得到不及格的成绩
If you hand in the report late, you'll get a fail.
如果你迟交报告，你就会不及格。
必定；一定
He calls his mother every Sunday without fail.
他每个星期天必定给母亲打电话。
彻底的失败；惨败
The company's new product launch was an epic fail.
那家公司的新产品发布是一次彻底的失败。
出自爱尔兰作家塞缪尔·贝克特，鼓励人不要因失败而放弃：试过，失败过，没关系。再试一次，再失败一次，失败得更好。
A fail in one exam is not the end of the world; you can always try again.
一次考试不及格并不是世界末日；你随时可以再试。
出自美国政治人物罗伯特·肯尼迪，意思是只有敢于承受重大失败的人，才可能取得巨大成就。
He got a fail in his driving test and decided to practice more.
他驾照考试不及格，决定多练习。
Use fail naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 fail 读成“费哦”——努力都白费了，就是失败、不及格。记住这个声音，失败的意思就记住了。
语域：formal 常见场景：金融交易结算、证券交易市场、正式财务报告 作名词表示‘失败’时，多用于正式或专业语境，尤指交易、结算等行动未能完成；这些场合比日常口语更书面化，通常用 failure 表示。需结合具体语境判断正式程度。
与 fail /feɪl/ 押韵的词：sail、mail、nail、tail、pale（都读 /eɪl/）。注意 said 拼写中有 -ai-，但发音是 /sed/，与 fail 不押韵。
Dictionary facts from ECDICT, WIKTIONARY.