The three main categories are green, black, and oolong.
最主要的三大种茶分别是绿茶，红茶，和乌龙茶。
Oolong tea is semi-fermented tea and is somewhere between green and black tea.
乌龙茶属于半发酵茶，茶多酚含量处于两者之间。
The team studied a chemical found in black, green, oolong and pekoe tea.
该小组研究了在红茶、绿茶、乌龙茶和香红茶中发现的一种化学物质。
The team studied a chemical found in black, green, oolong and pekoe tea.
该小组研究了在红茶、绿茶、乌龙茶和香红茶中发现的一种化学物质。
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