18. Some people have trouble digesting lactose, a carbohydrate in milk and milk products, because of the deficiency of enzyme lactase in the body.
有些人无法消化乳糖，一种在牛奶和奶制品中的碳水化合物，这是因为在他们的身体中缺少乳糖消化酶。
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19. The researchers used a computer to model the spread of lactase persistence, dairy farming, other food gathering practices and genes in Europe.
研究人员对欧洲地区的乳糖耐受性的传播、乳品业、其它食品聚集过程和基因进行了计算机建模。
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20. The positive rate of lactase deficiency test was highest on the second hour when 25g or 12.5g lactose was given, and the difference was significant.
分别摄入乳糖量25克、12.5克，乳糖酶缺乏检出率均在二小时后最高，差异显著；
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21. What you're supposed to know: Milk (cow, goat, sheep, human . . .) contains a sugar called lactose, which is normally broken down by the enzyme lactase.
必备知识：奶类（包括牛奶、山羊奶、绵羊奶及母乳等）含有一种叫作乳糖的糖类，它通常由乳糖酶分解。
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22. Comparing the gene cDNA and amino acid sequences with other lactase sequences from various sources, it showed a very low homology with most of other sequences.
将此基因与不同来源的乳糖酶基因序列进行比较发现，该基因与绝大多数乳糖酶基因同源性较低。
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23. Organic whole milk from our pasture-fed cows is skimmed to the desired fat level, and then the enzyme "lactase" is added to the milk and slowly mixed for 24 hours.
24. A soft capsule containing lactase is provided. The raw material, namely lactase, is added into moderate medicinal accessory to make suspension, emulsion, or solution.
含乳糖酶的软胶囊：主要由原料乳糖酶加适宜药用辅料可经制成混悬剂、乳剂、溶液剂中的一种作为内容物。
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25. The European mutation is different from several lactase persistence genes associated with small populations of African peoples who historically have been cattle herders.
欧洲的突变基因就与世代游牧的非洲少数人群身上的几种乳糖耐受性基因不同。
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26. These allergies shouldn't be confused with lactose intolerance, which is when the body doesn't produce enough of the enzyme lactase to break down lactose, a sugar in cow's milk.
27. Indeed, the rise of farming has been linked to evolutionary changes in genes for other enzymes, such as amylase, which breaks down starch, and lactase, which breaks down lactose in milk.
28. Indeed, the rise of farming has been linked to evolutionary changes in genes for other enzymes, such as amylase, which breaks down starch, and lactase, which breaks down lactose in milk.
A similar, less severe and metabolic disorder is congenital lactase deficiency. 类似的，病症略轻为一点的代谢紊乱疾病是乳糖分解酶素缺乏症。
Sweden has one of the world's highest percentages of lactase tolerant people. 其中瑞典为乳糖耐受性比例最高的国家。
Lactose intolerance stems from a deficiency of the enzyme lactase, which is needed to help digest lactose, a sugar in milk. 乳糖不耐症的病因是缺乏乳糖酶，这些乳糖酶是消化乳糖的必需物质，牛奶中的糖就属于此类。
