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It is practicable to extend life span．However，such a life is......

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Therefore, the peak that medicine has achieved becomes the beginning of its difficult situation, in which it faces a choice between two courses, both undesirable.
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The act to make life longer and to search for the ways of perfect health including beauty，youth and happiness is born to cause more problems about health that we are trying to deal with．prolongation延伸，延长部分；self-defeating弄巧成拙的，跟自己过不去的。
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