然后就是用砖块做沙坑，为了保持自然形态，在砖头上浇注了混凝土并铺上小石子。
They then built the sand pit initially with bricks, covered the bricks with concrete and then put small stones into the concrete to keep the natural appearance.
统砂石混凝土（也称细石混凝土） ，是由水、水泥及小石子组成的混凝土。
The sand stone concrete (or fine stone concrete), is mixed with water, cement and fine stone.
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