1. A crystalline substance, C15H14O6, derived from catechu and used in tanning and dyeing. 
   儿茶酸一种晶体物质，c15h14o6，来源于儿茶，用于制革和染色
2. This group constitutes 80 percent of the total polyphenols in tea. These include catechin and gallocatechin (hydroxyls at positions 5' as well as at 3' and 4' as in catechin), their esters with gallic acid, catechin gallate, and gallocatechin gallate, and their epimers. 
   这组成分占茶叶中总多酚类物质的80%。它们有几茶素和儿茶素(在5'位上以及如同儿茶素中一样在3'和4'位上羟基化)，它们与酸生成的酯，即儿茶素酸酯和儿茶素酸酯，以及它们的差向(表)异构体。
3. The formulas for these phenolic compounds are Epigallocatechin gallate is the main flavanol in dried green tea. 
   这些酚类化合物的分子式为:表儿茶素酸酯是干绿茶中的主要黄烷醇。
4. A raw material obtained from the heartwood of this plant, used in the preparation of tannins and brown dyes. 
   儿茶从这种植物的心材中提取的原料，用于生产单宁酸和棕色染料
5. Theanine, the ethyl amide of glutamic acid, is the main amino acid in the fresh leaf and contributes 1 to 2 percent of the dried weight, but other amino acids arise during the early part of the processing. 
   茶氨酸是谷氨酸的乙酰胺，它是鲜茶叶中的主要氨基酸，占干茶叶重量的1~2%，其它氨基酸则是在加工早期出现的。

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