When the driver fell asleep, the bus ploughed into a line of traffic.驾驶员睡着了，公共汽车撞进了行驶中的一排汽车。Two young boys are in a fistfight on a moving boxcar.两个小男孩正在一辆行驶中的棚车上打架。Low-speed crashes can still prove deadly, especially to children.低速行驶中发生的车祸证明是仍可致命的，尤其是对于儿童来说。