A famous proverd:"Give a man a fish and you feed for him one day.Teach him how to fish and you feed him a lifetime."Saying is "give a fish to solve his hungry,but can not solution of hunger for a long time,there will always need a fish to eat .If you wish him always has fish to eat .Please teaching him the method of fishing."Having fish to eat is purpose,fishing is means.This sentence.If you want to help others to solve problems.It is better to teach other to solve the problem .Education ,in fact it is the same reason.A good qualifled teachers,not only to give students knowledge,but also teach students self-study.The method of the United Nations educations ,scientific and cultural organization once said:The illiterate in the 21st century will be those who cannot read and write ,but those who cannot self-study and learned knowledge application.