中文说明：
Diffusion-limited 160 Aggregation（DLA）扩散限制凝聚，是由Witten和Sander于1981年共同提出来的。其基本思想是：首先置一初始粒子作为种子，在远离种子的任意位置随机产生一个粒子使其做无规行走，直至与种子接触，成为集团的一部分。然后再随机产生一个粒子，重复上述过程，这样就可以得到足够大的DLA团簇。
English Description：
Coursing together - 160 limited Aggregation (DLA) Diffusion limit cohesion, is jointly by Witten and Sander in 1981.Its basic idea is: first, set the initial particle as seed, in the far away from the seeds of randomly generated a particle at any position to make it do random walk, until contact with seeds, become a part of the group.And then randomly generated a particle, repeat the above process, so that you can get enough DLA clusters.