The earthquake forced some Japanese companies to halt production, disrupting the supply of key materials to other Asian countries.

地震和海啸迫使日本一些公司停止了生产，影响了向亚洲其它国家提供关键材料的出口。

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Since the Gran Chaco forest, a key habitat to the species' reproduction, is largely threatened, strong conservation action is needed to halt and reverse forest loss in this region.

由于这个物种的核心繁殖场所格兰查科森林已经严重受到威胁，这个地区需要采取有力的保护行动来制止和扭转森林的丧失。

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But when technical problems occur with a key hardware or software component all business can indeed grind to a halt.

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President Barack Obama's recent move to halt deportations of some DREAM Act-eligible immigrants and Monday's Supreme Court ruling against key provisions of the Arizona law brought fresh attention to immigration issues, causing obvious discomfort in the Romney camp.

CNN: Romney, GOP struggle with immigration issues

Key lending such as credit cards, car loans and student loans had essentially come to a halt in October, Mr Paulson said.

BBC: US Fed announces $800bn stimulus