在各种各样含有儿茶素（表没食子儿茶素没食子酸酯）的茶叶中，绿茶的儿茶素含量最高。
While all true teas contain EGCG (epigallocatechin-3-gallate), the various types of green tea have the most.
不过绿茶中的咖啡因含量比咖啡少得多：6 ~8盎司茶叶中大约含有30 ~60mg的咖啡因，而8盎司的咖啡中含有超过100 mg咖啡因。
However, green tea contains less caffeine than coffee: there are approximately thirty to sixty mg. of caffeine in six - eight ounces of tea, compared to over one-hundred mg. in eight ounces of coffee.
茶叶含有比焙炒咖啡更多的咖啡因(占干绿茶叶的2。7 ~4。6 %)，但在饮料方面，茶中的咖啡因平均浓度却稍低。
Tea leaves contain more caffeine (2. 7 to 4. 6 percent of the dried green tea leaf) than does roasted coffee. But the concentration in the beverage averages somewhat less in tea.
茶叶含有比焙炒咖啡更多的咖啡因干绿茶叶的2.7 ~ . 6%，但在饮料方面，茶中的咖啡因平均浓度却稍低。
Tea leaves contain more caffeine (2.7 to4.6 percent of the dried green tea leaf) than does roasted coffee. But the concentration in the beverage averages somewhat less in tea.
茶叶含有比焙炒咖啡更多的咖啡因干绿茶叶的2.7 ~ . 6%，但在饮料方面，茶中的咖啡因平均浓度却稍低。
Tea leaves contain more caffeine (2.7 to4.6 percent of the dried green tea leaf) than does roasted coffee. But the concentration in the beverage averages somewhat less in tea.
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