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原文：

Sports drinks are electrolyte-enhanced beverages. Their main purpose is to restore water and electrolytes that are lost during heavy exercise and sweating. They will contain electrolytes like sodium, potassium, calcium and magnesium. Many are carbohydrate-based, with added sugars like fructose, glucose and sucrose. Sometimes they contain caffeine.

译文：

运动饮料是电解质补充饮料。其主要作用是补充剧烈运动和出汗过程中流失的水分和电解质。运动饮料通常含有钠、钾、钙和镁等电解质，碳水化合物含量很高，还添加了果糖、葡萄糖和蔗糖等糖。有时也含有咖啡因。