If someone does something very difficult, then they can say they did it against odds or they beat the odds.

如果某人做某事很难，他们可以说，他们克服难关。

youdao

What were the odds against?

赔率是多少？

《柯林斯英汉双解大词典》

Against all (the) odds , he made a full recovery.

在凶多吉少的情形下，他终于完全康复了。

《牛津词典》

"We have battled against the odds in a province that has become increasingly violent.

VOA: standard.2010.05.26

"Even though I never had a chance to talk to him, I can imagine when he was here how he had to stay focused against all the odds.

VOA: standard.2009.08.19

The semi-final was against odds-on favourites Canada.

BBC: Rhona Martin tips Great Britain for double medals

The perilous battle that was fought during World War II in the Pacific at Iwo Jima was a battle against all odds, and yet this picture immortalizes the victory of young GIs over the incursion against the Japanese.

CNN: Transcript: Bachmann's response to State of the Union

Seemingly against the odds, LinkedIn has built a tremendous presence in the business of social networking.

FORBES: With LinkedIn IPO, B2B Marketing Gets The Spotlight