Ellagitannin, the main tannin in oak, is an important factor influencing the quality of grape wine in oak barrel.
鞣花单宁是橡木中的主要单宁，是影响橡木桶贮葡萄酒质量的重要因素之一。
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Ellagitannin mainly influences the following aspects of grape wine: sensory characteristics, the quality, distilling wine taste, and polyphenol content change.