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当前，不少青少年都在为革命勤奋学习。但是，有些同学不爱护自己的眼睛，出现了近视的情况，下面就谈谈近视眼是怎样形成的及其预防方法。
At present, many young people are studying diligently for the revolution. However, some students do not care for their own eyes, there has been myopia, the following will talk about the formation of myopia and its prevention methods.