With such favourable conditions, we'll have no excuse if we fail to increase output.

条件这样好，再不增产，可说不过去。

《新英汉大辞典》

If we fail to act, the crisis will grow.

如果我们失败了，危机将继续滋长。

youdao

And if we fail, they will denounce us.

如果我们失败了，会遭到谴责。

youdao

And the crisis had to be solved. "If we fail," Roosevelt said, "the cause of self-government throughout the world will suffer greatly."

VOA: special.2010.08.26

And if we fail, they will denounce us.

如果我们失败了，会遭到谴责。

普林斯顿公开课 - 国际座谈会课程节选

He says if we fail, then they are free to continue the drone attacks.

VOA: standard.2009.03.26

It is our fault if we fail to take the message we need to succeed.

FORBES: Your Reputation is No Joke - It's Your Super Power

America cannot long lead the family of nations if we fail the family here at home!

NPR: Transcript: Mitt Romney At The RNC

If we fail to act, our youth without skills may increasingly weaken our societies.

UNESCO: A lost generation in the making - 'Le Devoir' (Canada)