The result of attrition is that, where the areas of the whole leaves follow a normal distribution, a bimodal distribution is produced, one peak composed mainly of fragmented pieces, the other of the larger remains.

• 磨擦的结果是，在叶面上服从正态分布的地方就会产生两种分布方式，顶点上主要是小块，其他的地方是小块，其他的地方是大块的地方。