这个问题主要涉及三个方面：经济可持续性、环境可持续性及社会可持续性，包括肥料施用、作物保护、废物处理及劳作条件等内容。
The questions cover three main areas: economic, environmental and social sustainability, with topics ranging from fertilizer use, crop protection, and waste management to Labour conditions.
它是第一个从国家科学院所确定的可持续性主要目标，即从生产力、经济效益和环境这几方面来比较有机农业和传统农业。
It is the first to compare organic and conventional agriculture across the main goals of sustainability identified by the National Academy of Sciences: productivity, economics, and environment.
在美国，我们也正在继续完善我们的政策，以提高我们经济的长期可持续性和实力。
In the United States we're also continuing to refine our policies to improve the long-term sustainability and strength of our economy.
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