The main candidates for the American presidency Barack Obama and John McCain have set out their foreign policy differences, but both envisage a new focus on Afghanistan, Mr.

• 美国总统的两位主要候选人奥巴马和麦凯恩在他们的外交政策方面产生了分歧，尽管如此，他们两人却都把新的焦点对准了阿富汗。