We pulverise these to make it powder-like and we mix it with cement and sand and put it in a mould and turn it into concrete products.
我们把这些压成细粉，然后混合在水泥及沙里，之后把它放在一个模盒里，作成混凝土制的产品。
We pulverise these to make it powder-like and we mix it with cement and sand and put it in a mould and turn it into concrete products.
我们把这些压成细粉，然后混合在水泥及沙里，之后把它放在一个模盒里，作成混凝土制的产品。
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