茶叶和咖啡中的单宁酸会阻碍日常饮食中铁和锌的吸收。

The tannin in tea and coffee inhibits the absorption of iron and zinc from the diet.

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喝咖啡请趁热，因为咖啡中的单宁酸很容易在冷却的过程中起变化，而使口味变酸，自然影响咖啡的风味。

While it is hot cup of coffee, please, because coffee in the tannic acid is easy to cool in the process of change, tastes change by acid, natural flavor of the effects of coffee.

youdao

喝咖啡请趁热，因为咖啡中的单宁酸很容易在冷却的过程中起变化，而使口味变酸，自然影响咖啡的风味。

While it is hot cup of coffee, please, because coffee in the tannic acid is easy to cool in the process of change, tastes change by acid, natural flavor of the effects of coffee.

youdao