If you are asked to answer the question why you like sports, you'll probably say it's entertaining, it gets you stirred up, or it will let you have some thrilling sensation. In order to create this thrilling sensation for the spectators and for athletes as well, some athletes begin to turn to performance-enhancing drugs. Or they use the doping substances and doping methods to beat their opponents. Yet, in so doing, they have posed enormous hazards to their health and to our society.
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