剑桥词典a system in which a vehicle's engine supplies power to all its wheels instead of just to two, so that the vehicle can travel over very rough ground , or a vehicle that uses this system 四轮驱动系统；四轮驱动车辆（前后四个车轮均有动力，即使在恶劣路面上也可行驶自如） 比较four-wheel drive 返回 all-wheel drive