fail失败，未能，失灵

fail美 [fel]vi.失败，不及格；破产；缺乏；衰退vt.不及格；使失望；忘记；舍弃英 [feɪl] 

•If all else fails, you may be advised to have an operation.要是其他方法都不见效的话，恐怕你还是动手术的好。

fail to do sth

•They failed to persuade her to change her mind.他们没能说服她改变主意。

3.EXAM/TEST 考试/测验[I,T] to not pass a test or examination 不及格，未能通过

•I failed my driving test the first time I took it.我第一次驾照考试没过关。

4..失灵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。停止作用，失灵，出故障：

5.倒闭 So far this year, 104 banks have failed. 
 到今年为止，104家银行已倒闭。..

6. 枯萎，凋谢：

The flowers failed for lack of rain.

由于缺少雨水，花凋谢了。

7..衰退 减弱，消失，衰退：

  He was 58, and his health was failing rapidly. 
 他58岁，健康状况每况愈下。
Her sight is beginning to fail.

她的视力开始下降。

8..辜负  We waited twenty-one years, don't fail us now. 
 我们等了21年，如今不要辜负我们。

1.fail in失败；缺少

2.without fail务必；必定，无疑

3.never fail to一定会...