all-terrain vehicle是什么车？

四轮越野车,多指沙滩车或极限特种越野车.简称-ATV

When summer comes,there will be more rain.The muddy roads and traffic jams will make traveling difficult.In July,a special all-terrian vehicle emerged that is able to drive on roads,in muddy marshes,and in water.This vehicle provides a solution to traffic problems.Ordinary vehicles depend on wheels,which have the advantage of high speed,simple structure,and smooth driving.But when they have to drive on mud,sand or marsh,it's difficul to move.On the contrary,track vehicles,like tanks,can easily pass through but they have a more complicated structure and consume more fuel with lower speeds.The ATV has the advantages of wheels and tracks,ensuring smooth operation under any condition.On a smooth road,it runs as quickly using four-wheel drive like ordinary vehicles.When it comes across difficult terrainlike marsh and sand,the driver can hoist the four wheels through a hydralic pressure system to change it into a corss-country vehicle.Because of the ai