sand snow

The concept "aerodynamic roughness length" defined by Bagnold is an important parameter for wind erosion research. It has been widely applied in sand bed, vegetation conditions, snow bed and water surface.

由Bagnold提出的空气动力学粗糙度概念，是描述各种表面空气动力学特征的重要参数，已被广泛应用于沙面、植被覆盖表面、雪面、水面等。

When I took bus my house, There was snow on the building sand the housetops.

当我搭公共汽车时我的房子, 在建筑物沙子上有雪(这些)屋顶.

Jae: With this baby, we can drive on sand, gravel, mud, and even snow.

杰伊：有了这个宝贝儿，我们可以在沙地上，砾石，泥浆，甚至雪地上驰骋。

Beware of cloudy days and reflecting surfaces: snow, water, sand and concrete.

小心多云天气和反射光线平面: 雪 、 水 、 沙子和混凝土.

The patented All Weather Cover ? protects gear from extremes, torrential rain , snow, sand and tropical sun.

专利全天候 防雨 罩保护您的器材抵挡雨雪风沙日晒等极端恶劣天气.