But Lu stumbled across an enzyme produced by oral bacteria that can break up biofilms.

但是卢偶然间发现了一种口腔细菌产生的酶可以破坏生物膜。

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She turned around and started running back up the hill she'd just stumbled down.Up one hill, down the next.

她转过身，开始向刚才好不容易爬下来的山丘又爬上去，爬上一座山丘然后又爬下另一座。

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Today, I stumbled across another reason why I'd like to blow up online contests that use "vote for me" or popularity to make funding decisions.

今天，我无意中又发现一个我乐于鼓励通过“投我一票”或者受欢迎程度做出资助决定的在线比赛的原因。

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In terror I stumbled up with a harsh scrape of hangers, pulled wildly at the edge of the door, burst outside.

NEWYORKER: History of a Disturbance

He stumbled, walking up the steps to the apartment, and then threw up his dinner.

CNN: Lean on me: Loving and losing a dog

The US, attempting to defend their title, failed to progress from the heats after 200m finalist Muna Lee struggled to get hold of the baton on the second handover and stumbled before pulling up with a hamstring injury.

BBC: Jamaica's Bolt takes third gold