It's a long shot, but it just might work.

没有什么把握，但也许行得通。

《牛津词典》

I would imagine it's a long shot.

我猜想这会是个很大的赌注。

youdao

But his doctors admit it's a long shot.

然而他的医生承认这是强弩之末。

youdao

Eisenstat says it's a long shot but better than the alternative of a wider war.

NPR: Bush Calls for Peacekeepers �� But Where Are They?

It's a long shot, given that primaries tend to be dominated by highly ideological voters.

CNN: Will Bob McDonnell be a presidential contender?

Sure, it's a long shot, but Tebow wouldn't be brought in to challenge Tom Brady, of course.

WSJ: Done with Jets, 6 job possibilities for Tim Tebow