Tannins: The mouth-puckering substance--found mostly in red wines--that is derived primarily from grape skins, seeds and stems, but also from oak barrels. Tannin acts as a natural preservative that helps wine age and develop.
单宁： 使口腔感到干燥收敛的物质，它存在于大多数红葡萄酒中，主要来源于葡萄皮，葡萄籽和果梗，也能来自于橡木桶。单宁作为一种天然防腐剂，帮助于葡萄酒陈酿和发展。
