单词可以是sand，意思是沙、沙滩，例如：
1、Concrete is a mixture of sand and cement.混凝土是沙和水泥的混合物。
2、His hair was the colour of sand.他的头发呈沙褐色。
3、We went for a walk along the sand.我们去沙滩上散了散步。
4、The tracks of the large animal were clearly printed in the sand.这只大动物的足迹清晰地印在沙滩上。
