Browsers block rendering a web page until all external stylesheets have been downloaded.

浏览器阻塞渲染网页直到所有外部的样式表都已被下载。

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Although Block said that the company had already cut back on contracts with external recruitment services, the changes did not go far enough.

尽管布洛克说公司已经减少了外部服务合约，但这改变还不足够。

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The researchers believe that brief bursts of electrical activity in this area, called "sleep spindles", somehow block external sounds form reaching any parts of the brain that might wake a person up.

这个课题的研究人员们相信，在这个区域内简短的突发性电子活动“睡眠梭形波”，在用某种方式阻挡了外界声音信号传输到大脑中某些能让人醒过来的某些区域。

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An external stimulus such as music can actually block some of the internal stimuli trying to reach the brain such as fatigue-related messages from muscles and organs.

FORBES: Best Workout Playlists For Summer

The best hope now is that the European Union, the world's biggest trading block, seizes the baton of free trade from America something Sir Leon Brittan, the external-trade commissioner, boasts it has done already, for instance in last year's financial-services and telecoms trade deals.

ECONOMIST: Creeping protection | The