非游离的酸
A non-free acid
以上为机器翻译结果，长、整句建议使用 人工翻译 。
茶氨酸是茶叶中特有的、游离的非蛋白质氨基酸，其含量与茶叶品质呈正相关。
Theanine is a special kind of free amino acid in tea, which is not the constituent of protein, its content has positive relation with tea quality.
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