I'll never lose heart even if I should fail ten times.

即使失败10次，我也不灰心。

《新英汉大辞典》

Too may people have it in their heads that you should never fail. If you’re one of those people then I can say with absolute certainty that true success will never be yours.

有太多的人头脑里认定失败是不应该的，如果也你是其中一员，那么我保证，你不可能达到真正的成功。

youdao

Too may people have it in their heads that you should never fail. If you're one of those people then I can say with absolute certainty that true success will never be yours.

有太多的人头脑里认定失败是不应该的，如果也你是其中一员，那么我保证，你不可能达到真正的成功。

youdao

Should you fail to stop killing those babies, I think you should be punished for killing babies."

如果你不停止杀婴儿，你就会因为杀婴儿受到惩罚”

耶鲁公开课 - 心理学导论课程节选

Technically, I should fail out on the screener since I have worked for market research organizations, do such research myself from time to time, and definitely know how to game the system.

FORBES: Everybody Wants To Survey Me

"In the event that this should fail, I have already begun to lobby the leaders of other political parties in parliament, to refer the law directly to the Constitutional Court, " the DA's parliamentary leader Lindiwe Mazibuko said in a speech before the vote.

BBC: South Africa 'secrecy bill' approved by parliament

For the record, I am someone who believes that drugs should only be used when other modes of treatment fail.

FORBES: Why David Healy Is Wrong About the Safety of New Medicines