下面是对树木破坏较大的采集方法：其他的采集方法：桦树汁是一种很有价值的液体，对整个人体组织都有益。
The collection in severe conditions: More ways: The birch sap is very valuable product that influences well on the whole human organism.
对树木的大规模砍伐正在破坏环境。
The broadscale cutting down of trees is damaging the environment.
几个世纪以来，人类过度砍伐树木及过度集约耕作，一直在破坏环境。
Humans have been damaging the environment for centuries by overcutting trees and farming too intensively.
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