The week before Christmas vacation, I was walking through the mail room during the morning break when I saw Jimmy Hardigan, a senior, slam his fist against the wall.

圣诞假期的前一周，趁着早休，我去收发室查信。看见四年级的吉米·哈迪根用拳头砸墙。

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Microbiogen USES dilute sulphuric acid to break down another component of the plant cell wall: a complex polymer called hemicellulose, which binds cellulose microfibres together.

Mirobiogen使用稀硫酸打破了植物细胞壁的另一个组成部分：称为半纤维素的复杂复合物，它将纤维素捆绑在一起。

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It sounds counterintuitive, but you'll break through their miniscule personal space wall, forcing them to take a step back.

这听起来有悖常理，但可以打破对方狭隘的个人空间界限，迫使其后退一步。

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Video from the scene showed firefighters shooting streams of water at the club and shirtless men trying to break down a wall with axes.

CNN: Hundreds killed in Brazil nightclub fire

Saving jobs was a radical break at a time when Wall Street was cheering companies such as Delta for cutting 15, 000 jobs.

FORBES: Teaching an airline to fly

Fresh drops speckled his windshield as he turned in to his neighborhood, through a break in the stone wall that had once marked the bounds of the farm.

NEWYORKER: Outage