Sediment as you know, is material like sand, gravel, fossil fragments that is transported by natural processes like wind, water flow or the movement of glaciers.

如你所知，沉积物是通过风、水流或冰川运动等自然过程输送的物质，如沙子、砾石、化石碎片等。

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Daniel says variations along coastlines depend upon not only the type of rock in the immediate hinterland, but also whether or not the sand is transported along the coast.

丹尼尔说海岸变化并不是决定海滩颜色的唯一因素，也取决于沙子是不是沿着海岸运输过来的。

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Specialists and scholars of Japan think that the sand -dust is long -distance transported by upper westerly air from the desert in the northwest China and Loess Plateau in China to Japan.

日本专家学者认为，发生于中国西北沙漠、黄土高原的沙尘通过高空西风气流远距离输送是造成日本黄沙的主要原因。

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Believe it or not, the cleaning must be sufficiently scrupulous so as to ensure that not a single grain of desert sand is transported out of the Middle East, lest it carry bacteria or diseases back to U.S. shores.

CENTERFORSECURITYPOLICY: Dunkirk in the desert