sand mixing

例句：

1. 1. The engineer mixed sand and water to make a new concrete.
   工程师将沙子和水混合制成新的混凝土。
2. 2. The construction workers mixed sand for the road base.
   建筑工人为道路基础混合沙子。
3. 3. The sand mixing machine is used to blend different materials together.
   沙混合机用于将不同材料混合在一起。