In the rare chance that there is a microorganism that can make you sick on the exact spot where the food dropped, you can be fairly sure that the bug is on the food you are about to put in your mouth.

极少数情况下，有一种微生物可以在食物掉落的那一刻让你生病，你可以十分确定这种细菌就在你准备放进嘴里的食物上。

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But it also offered a rare chance of leisure.

但是它也提供了一丝放松的机会。

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So Africa has a rare chance to break out of its poverty trap.

因此，非洲拥有了一个摆脱其深陷贫困处境的千载难逢的机会。

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The event,on July sixteenth, was a rare chance for planetary scientists to share with the public the mysteries of Mars.

VOA: special.2010.07.28

So, if you by chance, I know it's very rare, but if by chance you don't get the class you can always follow up later.

如果你们偶然，我知道不太可能，但是如果不小心你们错过了某节课,你们就可以在之后补回来了。

麻省理工公开课 - 固态化学导论课程节选

Owusu had a rare chance for the Owls but shot over from 18 yards.

BBC: Walsall 1-0 Sheff Wed

With cash in hand and new ideas, Britain has a rare chance to blaze a trail.

ECONOMIST: Reforming foreign aid

Fernando Torres had an angled shot blocked by Blues keeper Ben Foster in a rare chance for the visitors.

BBC: Birmingham 0-0 Liverpool