这些细胞的更新过程随时间的推移而有所变化，弗瑞森补充道。

The process of renewing these cells changes over time, Frisen added.

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他的主要对手鲁迪·朱利安尼、米特·罗姆尼和弗瑞德·汤姆森都把重点放在反恐的艰难上，而尽量避开伊拉克战争问题。

His main rivals, Rudy Giuliani, Mitt Romney and Fred Thompson, emphasise how tough they will be on terrorists but say as little as possible about Iraq.

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周五在好莱坞《大象的眼泪》片场，罗伯特·帕丁森与克里斯托弗·沃尔茨、瑞茜·威瑟斯彭都盛装亮相，完成影片的最后一组镜头拍摄。

Robert Pattinson, Christoph Waltz, and Reese Witherspoon got all dressed up to film a few scenes from their latest flick Water for Elephants on Friday in L.A..

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