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公路旁的树木绿化带具有的诸多优点是众所周知的。在公路事故中，我们经常可以看到，有时是树木所受的损伤较人，也有时是汽车所受到的损害较重。根据我们的调查分析，其受损程度与树木径级有很大关系。以胸径为2（kll及其以下的树木为例，它的抗外力冲击能力是由（l）树根摒地
The many advantages of the trees along the highway are well known. In highway accidents, we can often see that trees sometimes suffer more damage than others, and sometimes they suffer more damage. According to our survey and analysis, the degree of damage is closely related to the diameter of trees. To breast diameter of 2 (kll and below the tree, for example, its resistance to external shocks by (l) remove the tree roots