Portland Cement cement is a material that holds together the sand and crushed stone in concrete.
硅酸盐水泥是可以将沙和碎石混合黏住的物质。
Portland Cement cement is a material that holds together the sand and crushed stone in comcreteconcrete.
硝酸盐水泥能将混泥土里得沙石粘合在一起。
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