Some of the culinary herb tea mixtures sold in the US are flavor enhanced with volatileoils or other aromatic ingredients that make a tastier drink but don't add healing benefit.
一些在美国出售的香草茶是添加了挥发油或其他芳香成分混合的，能使饮料可口，但并没有其他有益成分。
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Volatileoils, which give certain herbs their distinctive aroma, are not particularly soluble in water, but many plants containing them can be made into effective teas when properly prepared.