树木的减少扰乱了生态系统，因为固定表层土壤，保持旱季降雨，净化地下水和将二氧化碳转化为氧气都需要树木。
The loss of trees upsets the ecosystem as trees are necessary to build topsoil, maintain rainfall in dry climates, purify underground water and to convert carbon dioxide to oxygen.
树木的减少扰乱了生态系统，因为固定表层土壤，保持旱季降雨，净化地下水和将二氧化碳转化为氧气都需要树木。
The loss of trees upsets the ecosystem as trees are necessary to build topsoil, maintain rainfall in dry climates, purify underground water and to convert carbon dioxide to oxygen.
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