正文：Some natural disaster is hard to resist,but some natural disaster like acid rain,sandstorm and so on is caused by human beings themselves because of their deforestation and overdone pollutant
may emphasize the former,the old may,however stress the my opinion,both book knowledge and personal experience are of equal gained from experience may be firsthand,direct,and unforg
Of all the knowledge we have, some comes from the books we read, some comes from personal experience in our lives. Different people attach different importance to different sources. The young and the educated
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