Unless, by some chance, they believe in Magic.

除非，鬼使神差让他们相信了魔术师的话。

youdao

And, if by some chance you don't, you'll have a great life anyway.

即使由于某些原因你没能去成，你的生活依然是丰富多彩的。

youdao

I'm afraid that Li and Ku left most of the school's travel allowance at home. They brought so much luggage. If by some chance we run out of money along the way, it'll mean trouble for everyone.

我只怕李和顾把学校旅费大部分留在家里，带的行李又那么大一堆，万一路上钱不够起来，岂不耽误大家的事。

youdao

Even if by some chance all 170 countries endorsed the toughest proposal on the table, global warming would only be slowed.

CNN: Hot Air In Kyoto

If by some chance public pressure and collective conscience prompt lawmakers to embrace reform, Clinton will claim it as a victory for his leadership.

CNN: AllPolitics - TIME This Week

You can draw whatever life lessons you like from that, but the main thing is clear: No one should ever be afraid for Mariano Rivera, and if by some chance he decides to come back for another year, he'll devise some way to make it another nearly perfect one.

WSJ: Mariano Rivera's Key: Change...Oh, and Cutter