l-theanine 基本例句 L-茶氨酸 Black tea can help you concentrate. A study at the University of Northumbria found that caffeine and L-theanine in black tea leaves improves cognitive skills. 饮用红茶可以帮助您的注意力得到集中，因为红茶里面的咖啡因以及茶氨酸可以改善大脑的认知功能。 cri L-Theanine is a peculiar non- protein amino acid in tea. 茶氨酸是茶叶中特有的非蛋白质氨基酸。 cnki