The environmental equation of tracking animal production from feed to table goes like this: to produce a kilogram of beef, farmers have to feed a cow 15kg of grain and 30kg of forage.

跟踪动物产品的养殖到餐桌的环境方程序是这样的：生产1公斤牛肉，农民必须给牛喂15公斤谷物和30公斤草料。

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Why didn't calorie tracking, as well as caloric restriction, produce both psychological and physiological stress responses?

为什么没有计算卡路里摄入量和能量摄入控制会产生心理和生理的紧张反应呢？

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Combining these overlays to form relationships and tracking them over time can further produce incredibly dynamic and capable applications.

通过合并各层的信息建立它们之间的关系并进行跟踪，可以生成更加动态和强大的应用程序。

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But tracking produce is not that simple.

ECONOMIST: Tech.view

But because it involves tracking each year group of pupils, it has taken five years to produce the first results.

BBC: NEWS | UK | Education | How 'value added' works