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。
2
Black Currants sweetened only with grape juice concentrate.
黑加伦的甜来源于浓缩的葡萄汁。
3
The modification has been made on the black wattle tannin adhesive with sodium sulfite and the MUF concentrate so as to prepare out a tannin adhesive with good water-proof and better glue properties.