平均分布计算大概一平方米面积布置一块透气砖，与水箱模型尺寸相近。
On average there is one porous plug on each square meter, which justifies the choice of the water model dimensions.
设定一个模型：两个企业的销售点分别在一条公路或线路的两头，而消费者在这条线路上平均分布。
We model the firms as stores that are on either end of a long road or line. Customers live along this line.
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