How could he fail?

他怎么就失败了呢？

youdao

Should he fail, he will find himself swiftly transformed from wished-for saviour into yet another inadequate bungler.

如果他失败了，他会发现自己的形象将很快从众人期待的救世者，转变为又一个无能的冒失鬼。

youdao

He won't allow himself to fail.

他不容许自己失败。

《柯林斯英汉双解大词典》

He dug deep into the darkness, hitting the steel so hard that his body began to fail him.

VOA: special.2009.02.21

He doesn't at first hear the horn fail to blow, and then later, when a truck pulls up behind him, he fails to hear a horn that does blow: He was looking at the sign, and he didn't hear the horn.

在一开始,是他没有注意到这点，到后来卡车停在身后时，他连响的喇叭都听不到了：,“他看着那个标牌，以至于没听到喇叭声。

耶鲁公开课 - 1945年后的美国小说课程节选

The wonderful line he has in his last prose-fiction "Worstward Ho", Try again, fail again, fail better.

在他最后一部散文小说《向西去啊》有一句，再尝试，再失败，却更好地失败。

普林斯顿公开课 - 人性课程节选

Should he fail to reject weak candidates, he will have only himself to blame.

ECONOMIST: President Prodi

Not only did he fail to carry his weight, he was a constant and serious drain on the Army's efficiency.

CNN: Private Ryan was a hero, but there were bums, too

Republican voters perceive Mitt Romney as lacking authenticity, and should he fail to win the nomination, that will be the primary reason.

FORBES: Gingrich: Authentic Prodigal Son