It is the tannic acid contained in oak that ages the brandy. 正是櫟木里含的丹寧酸使白蘭地變芳醇了。
Tannins of the first type which are found in tea generally yield glucose and gallic acid when they are hydrolyzed. 第一種丹寧酸發(fā)現于茶葉中，通常將它們水解時(shí)會(huì )產(chǎn)生葡萄糖和沒(méi)食子酸。
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