植物药用成分的确存在天然生物活性的问题。
Herbal ingredients have the problem of natural biological activity.
这不仅能帮助当地的卫生工作者，还通过分类天然植物的有效成分和无效成分可能在无形中为非洲药用植物打开了国际市场。
Not only will this information help local healthworkers, by winnowing what works from what does not, it may also increase international trade in African herbal medicines.
黄烷酮类化合物广泛的存在于自然界中，是多种药用植物的有效成分之一。
Flavanone compound is widely distributed in nature, which is one of powerful ingredients of many medicinal plants.
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