UN chemical weapons inspectors have left the scene of last week's suspected poison gas attack on the outskirts of Damascus after spending nearly three hours there. The UN Secretary General Ban Ki-moon ____________________________________ Yolande Knell reports. 联合国化学武器检查员已离开了上周疑似发生毒气袭击的大马士革郊区,在此之前他们在该地区逗留了大概三个小时进行检查.联合国秘书长潘基文___________________________约兰德?尼尔报道.