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.是什么意思_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.在线翻译_英语_读音_用法_例句