Cách sử dụng
An axle is a rod or a shaft that connects two wheels of a vehicle. It helps the wheels to rotate together so that the vehicle can move smoothly. For example, a car has four axles, one connecting each of the four wheels. Similarly, a bicycle has two axles, one connecting each of the two wheels. Axles can also be used in other machines, such as trains and airplanes, to connect rotating parts.