1、A hovercraft travels on a cushion of air.
2、A hovercraft rides on a cushion of air.
3、Some, like long-legged water striders, maintain a small measure of distance from the water with a cushion of air that lets them skate on the surface.
4、A hovercraft is like a boat, but it does not float directly on the water: it floats on a cushion of air.
5、They figured out how to move the vehicle freely, not juse across land, but up and down on a cushion of air.
6、The middle ball effectively suspends them on a cushion of air 700mm off the ground and the ball is then rolled down a hill.
7、If one of your research staff announced that he had worked out a way to propel a vehicle on a cushion of air, would you tell him to concentrate on something practical, or suggest taking it further?
