The sand is a kind of solid which has small and rough.
The sand is in small grains,they are loose and does not dissolve in water.
英语翻译沙子是固体的一种沙有粗有细（2）沙是一粒一粒的（3）沙是松散的（4）沙不溶解于水.
The sand is a kind of solid which has small and rough.
The sand is in small grains,they are loose and does not dissolve in water.