noun[ C or U ]USuk/ˌɔːl.wiːl ˈdraɪv/us/ˌɑːl.wiːl ˈdraɪv/
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）
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