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N-UNCOUNT If you say, for example, that someone is of French extraction, you mean that they or their family originally came from France. 血统 [正式] [with supp]
Her real father was of Italian extraction.
她的生父是意大利裔。
The paper put forwards the way of extracting refining stevioside by boiling water from the leaves of stevia rebaudiana bertoni and removing impurities from extract by alcohol and ion exchanger.
介绍了用水提取、醇沉淀和离子交换树脂精制等工艺从甜叶菊中提取甜菊苷的方法。
Richly contain chamomile extract, natural floral aromatic essence active oxygen ion, moisturize skin, relieve strain and fatigue for a whole day.
富含洋甘菊萃取液、天然花草香芬精华及活氧离子，清洁滋润肌肤的同时舒缓肌肤一整天的紧张和疲劳。
Objective:Using organic membrane filtration and ion exchange to extract L-valine from the fermentation broth.
目的：利用有机膜过滤和离子交换法分离提取发酵液中的L-缬氨酸。
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