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树木可以调节气候、净化空气、防风降噪,是人类最好的朋友。树木是氧气制造厂。1公顷阔叶林1天可以吸收1吨二氧
Trees can regulate the climate, purify the air, wind and noise reduction, is the best friend of mankind. Trees are oxygen factories. One hectare of broad-leaved forest can absorb 1 ton of dioxygen per day