地理漫步·世界地理英语30篇（7）
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Forests Clean Air and Hold Water
森林净化空气并涵养水源
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Trees take in carbon dioxide and give out oxygen.树木吸收二氧化碳，释放氧气。
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Forest roots hold soil so rain does not wash it away.森林的根系固定土壤，防止雨水冲走。
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Leaves catch rain and let it soak into the ground.树叶承接雨水，使其渗入地下。
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This keeps rivers full in dry months.这使得旱季河流水量充足。
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Tropical forests have more kinds of trees than anywhere else.热带雨林的树种比其他任何地方都多。
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Boreal forests cover cold northern lands.北方针叶林覆盖寒冷的北方地区。
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Cutting too many trees causes floods and droughts.过度砍伐树木会导致洪水和干旱。
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Planting new trees helps the whole planet.种植新树有助于整个地球。