Visiting Downing Street earlier in the day, Mr Obama was at once emollient, self-critical and articulate, in a way that put an initially bashful Gordon Brown at his ease.

• 白天奥巴马还参观了唐宁街，那里他的圆滑，自我批评与清晰的表达，使害羞的高登布朗首相也变得放松下来。