As american attack helicopters circled overhead in the karrada district of baghdad early sunday morning, hundreds of people-young and old, mothers, fathers and children-walked nervously down heavily guarded streets 星期天一早,美国的攻击直升机在巴格达卡拉巴地区的上空盘旋,数以百计的男女老少民众小心翼翼的穿过得到重重保护的街道。