The children seemed to tumble about and amuse themselves like a litter of rough, good-natured collie puppies.

孩子们好像在打滚，像一窝乱蓬蓬、脾气好的柯利牧羊犬幼犬一样自娱自乐。

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Labeled antibodies that have not docked to the sample tumble about so rapidly in solution that they give off no magnetic signal.

带磁性颗粒的抗体要是没有与样本产生结合，会在溶液中快速旋转，因而无法产生磁性讯号。

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with the Crazy Truth, recently spoke with Metromix Jersey Shore about his transition from pop-rock to the tough-and-tumble world of punk.

最近和Metromix Jersey Shore谈了关于他是如何从流行摇滚进入了tough-and-tumble的punk世界。

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"This is a rough-and-tumble place and it's nice to come back to two people who care about me, who care about my success, who care about the difficulties I might be having either at work or at home and just to have two friends who are a sounding board."

VOA: standard.2010.08.07

Wading through snow the consistency of porridge, we tumble about like giant toddlers.

BBC: In Sweden, a long journey home

That left the stock to tumble about 10% since mid-September.

FORBES: Move up http://i.forbesimg.com t Move down

In fact, the small electronic retailer has seen its share price tumble by about one-third in the past two years.

FORBES: HHGregg Suffers Same Malady As RadioShack, Best Buy