1.

V-T/V-I

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. 未能

例：

The party failed to win the election.

该政党未能赢得选举。

例：

He failed in his attempt to take control of the company.

他的掌控这家公司的企图失败了。

2.

V-I

If an activity, attempt, or plan fails, it is not successful. 失败

例：

We tried to develop plans for them to get along, which all failed miserably.

我们设法制定出让他们相处融洽的计划，但都惨败了。

例：

He was afraid the revolution they had started would fail.

他担心他们发起的革命会失败。

例：

...a failed military coup.

…一次失败的军事政变。

3.

V-T

If someone or something fails to do a particular thing that they should have done, they do not do it. 未做

[正式]

例：

Some schools fail to require any homework.

有些学校没有布置任何家庭作业。

例：

He failed to file tax returns for 1982.

他没有填报1982年的纳税申报单。

4.

V-I

If something fails, it stops working properly, or does not do what it is supposed to do. 失灵

例：

The lights mysteriously failed, and we stumbled around in complete darkness.

灯神秘地熄灭了，我们在完全的黑暗中跌跌撞撞。

5.

V-I

If a business, organization, or system fails, it becomes unable to continue in operation or in existence. 倒闭

[商业]

例：

So far this year, 104 banks have failed.

到今年为止，104家银行已倒闭。

例：

...a failed hotel business.

…一家倒闭的酒店。

6.

V-I

If something such as your health or a physical quality is failing, it is becoming gradually weaker or less effective. 衰退

例：

He was 58, and his health was failing rapidly.

他58岁，健康状况每况愈下。

例：

Here in the hills, the light failed more quickly.

在这儿的山里，光线减弱得更快了。

7.

V-T

If someone fails you, they do not do what you had expected or trusted them to do. 辜负

例：

We waited twenty-one years, don't fail us now.

我们等了21年，如今不要辜负我们。

8.

V-T

If someone fails a test, examination, or course, they perform badly in it and do not reach the standard that is required. 使不及格

例：

I lived in fear of failing my final exams.

我生活在期末考试不及格的担忧中。

9.

N-COUNT

Fail is also a noun. 不及格

例：

It's the difference between a pass and a fail.

这是及格和不及格的区别。

10.

V-T

If someone fails you in a test, examination, or course, they judge that you have not reached a high enough standard in it. 使不及格

例：

...the two professors who had failed him during his first year of law school.

…他上法学院第一年时使他不及格的两位教授。

11.

PHRASE

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. 迫不得已的话

例：

If all else fails, I could always drive a truck.

迫不得已的话，我总可以开卡车。

12.

PHRASE

You use without fail to emphasize that something always happens. 必定

[强调]

例：

He attended every meeting without fail.

他逢会必参加。

13.

PHRASE

You use without fail to emphasize an order or a promise. 务必

[强调]

例：

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。