close sand

Close the window at once, lest wind and sand should blow in.

快把窗户关好, 不然风沙就会刮进来.

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This time's sand, crystal clear, hard, is full, is close.

这时候的沙子，晶莹、坚硬、饱满、紧密。

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When the sands movement starts, the concentration very close to the sand surface is changeless with the wind velocity.

风沙运动一旦发生时，靠近沙床表面的沙粒浓度随风速变化很小，可以认为趋于稳定，达到最大值。

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The earliest form was a simple bamboo tube packed with sand that was strapped to a spear. Such a weapon would have been able to blind an enemy and give the wielder the advantage in close quarters combat.

它最早的形式是：把装满沙子的竹筒绑在一个长矛上，这样，就可以弄瞎敌人的眼睛，在近距离搏斗中取得优势。

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In addition, there was close relation between the physicochemical properties of different soils and the reduction rates of Nitrobenzene compounds, showing the rule of clay light loam sand.

不同土壤物理化学性质与硝基苯类化合物的还原率有密切关系，表现为黏土轻壤土砂土的规律；

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