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n.【化】黄嘌呤;黄质网络黄嘌呤类;茶碱;茶硷变形:复数:xanthines英英释义: xanthine[ 'zænθi:n, -θain, -θin ]n.crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine