研究团队使用一个模型来观察几种种植和管理方式下的行道树变化。
The research team used a model to watch changes among street trees for several planting and management methods.
20年过去了，发生了很多变化，但从邮局到村子的路上一直没有树，除了飞扬的灰尘什么都看不到。
20 years flew by, and so many changes took place, but the road from the post office to the village always hadn't had any trees and nothing but the flying dust could be seen.
树会成长、变化、老去，就跟天空的浮云一样。
Trees grow and change and dissipate like their airborne Cousins.
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