用英文介绍食物金字塔介绍清楚就行,不用很深奥
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食物金字塔 Food Pyramid
food pyramid
A way of showing a healthy diet graphically, by grouping foods and the amounts of each group that should be eaten each day, based on nutritional recommendations. Originally developed in the USA in 1992, and now adopted in many countries, with differences to allow for different national patterns of diet.
A graphic representation of the structure of a food chain, depicted as a pyramid having a broad base formed by producers and tapering to a point formed by end consumers. Between successive levels, total biomass decreases as energy is lost from the system.
参考图片:http://content.answers.com/main/content/img/oxford/Oxford_Food_Nurition/0198609612.food-pyramid.1.jpg
