名词
中文翻译：单宁
同义词：
['tannin', 'catechu', 'gallotannin']
例句：
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1.The wood tannin in the wine has a bitter taste.
葡萄酒中的单宁有苦味。
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2. The tannins in the tea leaves are responsible for their color.
茶叶中的单宁决定了它们的色泽。
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3. The tannins in the wine help to age the wine over time.
葡萄酒中的单宁有助于随着时间的推移使酒陈化。