咖啡因是茶和咖啡这类饮品的活性成分。

Caffeine is the active constituent of drinks such as tea and coffee.

《柯林斯英汉双解大词典》

三种综合咖啡呈现出成分和烘培度的差异。

These blends vary both in constituent coffees and roast intonation.

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所以是咖啡中的什么成分赋予它如此健康的特性呢？

So just what does coffee contain that gives it such healthful properties?

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