fail

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fail的基本意思是“失败”,指在从事某项工作时未能达到预定的目的,常常强调做了,但是没有成功; 还可指由于某事未能在头脑里形成深刻的印象或其他原因而将某事“忘记”。fail引申可指“不足,短缺,缺乏”“衰退,衰弱”“破产”“辜负”等。
fail可用作及物动词,也可用作不及物动词。用作及物动词时接名词、代词或动词不定式作宾语。
fail在作“不能,不会,不成功”解时,其后只能搭用不定式短语或介词in。
fail在作“亏损”“销蚀”解时可用于进行体,此时多指人的体质。
fail是表示状态的及物动词,不能用于被动结构。

Some college courses are graded in terms of either a pass or a fail.
有些大学课程按及格或不及格打分。

(NOT SUCCEED) to not succeed in what you are trying to achieve or are expected to do
(EXAM) to be unsuccessful, or to judge that someone has been unsuccessful, in a test or exam
(NOT DO) to not do something that you should do
(STOP) to become weaker or stop working completely
(NOT HELP) to not help someone when you are expected to do so
an unsuccessful result in a course, test, or exam
If you do something without fail, you always do it.

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.
If an activity, attempt, or plan fails, it is not successful.
If someone or something fails to do a particular thing that they should have done, they do not do it.
If something fails, it stops working properly, or does not do what it is supposed to do.
If a business, organization, or system fails, it becomes unable to continue in operation or in existence.
If something such as your health or a physical quality is failing, it is becoming gradually weaker or less effective.
If someone fails you, they do not do what you had expected or trusted them to do.
If someone fails a test, examination, or course, they perform badly in it and do not reach the standard that is required.
Fail is also a noun.
If someone fails you in a test, examination, or course, they judge that you have not reached a high enough standard in it.
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.
You use without fail to emphasize that something always happens.
You use without fail to emphasize an order or a promise.