four-wheel drive
noun uk/ˌfɔː.wiːl ˈdraɪv/ us/ˌfɔːr.wiːl ˈdraɪv/
[ C or U ] (also 4x4); (written abbreviation 4WD)（车辆的）四轮驱动
If a vehicle has four-wheel drive, its engine supplies power to all four wheels instead of the usual two, so that the vehicle can travel easily over difficult ground.
Compare: all-wheel drive
[ C ]四轮驱动车
a vehicle that uses this system