研究观察运动员跑完马拉松后的体重，发现一些跑者比赛时喝太多水，让他们的表现受到影响。
A study looking at athletes' body weight after a marathon suggests some runners are drinking too much during RACES and impairing their performance.
当他开始参加5公里和10公里的比赛时，体重也开始下降。
The weight starts to come off as hesigns up for 5km and 10km races.
当他开始参加5公里和10公里的比赛时，体重也开始下降。
The weight starts to come off as hesigns up for 5km and 10km races.
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