condensed tannin

例句：

1. 1. The wine ismade from grapes that have been condensed to remove the skins andseeds.
   这种酒是用去除了皮和籽的葡萄制成的。
2. 2. Condensed tannins are often used in food preservatives to prevent spoilage.
   浓缩单宁常用于食品防腐剂中，以防止变质。
3. 3.The process of condensing tannins can be used to create a varietyof products, such as leather and paper.
   通过浓缩单宁的过程可以制造出各种产品，如皮革和纸张。