今天BBC5间直播室共同直播的抽签仪式结束，卫冕冠军罗杰·费德勒将在今年的巴克莱at P世界巡回赛总决赛上遭遇纳达尔，重演2010年决赛在O2球场惊心动魄的三盘苦战。

Defending champion Roger Federer will meet Rafael Nadal in round-robin play at this year's Barclays ATP World Tour Finals at the O2 in a replay of their thrilling three-set 2010 final.

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瞧瞧巴里·邦兹和罗杰·克莱门斯吧。

Look at Barry Bonds and Roger Clemens.

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这种物质是约翰霍普金斯大学医学院的罗杰·克莱姆教授和理查德哈甘耐尔教授在研究训练老鼠把一种特定的声音和电击联系在一起这一课题时发现的。

Roger Clem and Richard Huganir of the Johns Hopkins University School of Medicine made the discovery while studying mice conditioned to associate a particular sound with an electric shock.

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