It is surely a new experience! Suzzane will make an introduction of three traditional foods and tell you what they meant to the American Indians hundreds of years ago.

这绝对是一种全新的体验！Suzzane 将介绍三种传统食物，并告诉你数百年前它们对美洲印第安人意味着什么。

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However, some of the genes used to manufacture GM foods have not been in the food chain before and the introduction of new genes may cause changes in the existing genetic make-up of the crop.

然而，用于生产转基因食品的一些基因以前从未出现在食品链中，因此，采用新基因可能改变农作物现有的遗传基因。

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But the research team was able to conclude that infectious diseases and the introduction of new foods were the primary reasons that some genes swept through populations with such speed.

但他的研究团队可以断定，传染病和新的食物是某些基因以如此快的速度成为人类基因的主要原因。

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One theory to explain why early introduction is important holds that if babies aren't exposed early enough to certain foods, their immune systems will treat them as foreign substances and attack them, resulting in an allergy.

WSJ: Food Allergy Advice for Parents: Start Peanuts, Eggs and More Sooner