A rigorous physical test performed by Bagnold proved that dust can fly up to 3000 m high over great distances with wind,while sand grains can move at most by means of saltation near the land surface.

• 拜格诺用严格的物理实验证明，尘粒能随风远走高飞，而沙粒却只能在地面附近跳跃前进。