For a better experience on your device, try our mobile site. BBC UKChina 手机版 Usain Bolt takes just 9.63 seconds to win a gold medal in the London 2012 men's 100m final. Photo: Alex Livesey. 今日短语 短语 a ...

LONDON (Reuters) - Usain Bolt says he is fit and ready for the London Olympics and is convinced his defence of the 100 metres title could trigger one of the fastest ever races in the blue riband ...