1. Red wine gets its astringency from tannins found in the grape skins.
红葡萄酒的涩感来自葡萄皮中的鞣质。
2. Black tea contains a high amount of tannin, which gives it a strong and bitter taste.
红茶含有丰富的单宁酸，令其具有强烈的苦涩口感。