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Marathons can be bad for your health, scientists have warned after a study found 80 percent of competitors suffer kidney injury because of dehydration. 科学家警告称，马拉松可能会对人体产生危害。他们的研究发现，由于缺水，百分之八十的马拉松比赛选手都患有肾功能损伤。 Researchers said that although the kidneys of the participants in the 26.2 mile race fully recovered within two days, their findings raise questions concerning the potential long-term impact at a time when marathons are increasing in popularity. 研究人员称，尽管参赛者跑完26.2英里（42公里）后，他们的肾脏两天内就能完全恢复正常，但如今马拉松比赛日渐流行，研究结果引起了人们对于马拉松长期潜在影响的担忧。 The findings were published by the American Journal of Kidney Diseases, as thousands of people prepare for next month's London Marathon. 《美国肾病杂志》刊登了这项研究成果。与此同时，上千人正摩拳擦掌，为下个月的伦敦马拉松赛做准备。 | 
