At present the study of the movement of sands mainly focuses on theoretical analysis of and numerical simulations of blown sand on the flat bed of sand.
目前对风沙运动的研究主要集中在对平坦沙床上的风沙流进行理论与数值模拟，而对复杂地形和沙丘上的风沙运动的理论与数值模拟则相对很少。
The prospector panned off bits of sand and gravel scooped from the bed of a stream.
探矿者淘选从河床中挖出的少量含金泥砂和沙砾。
And besides, regardless of when you read this tutorial, I posted it after a Memorial Day of fun in the sun on the beaches of Florida. I just put the family to bed and I still have sand on my feet.
除此之外，不考虑阅读教程的人很多是初学者的问题，发布这篇教程的时候，我正在佛罗里达州的阳光海滩上，脚上还沾满了沙子。
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