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there is a saying that forest is the lung of the earth. trees can absorb harmful gas, and generate gas which will make the quality of the the air more suitable for us to live. with the economic boom, more and more buildings have been constructed. many trees were cut down to meet the requirement of the inreasing buildings. it is true that trees are  geting less on the earth and the air condition is getting worse. if we do nothing to protect forests today, how could our offspring survive decades later?


[ 此帖被madcat在2008-06-08 16:25重新编辑 ]