Never underestimate the power of a team that believes in a shared vision.
True progress in agriculture measures success by both harvests and ecosystem health.
模型的目的是足夠簡(jiǎn)單以便理解和使用，但又足夠復(fù)雜以捕捉系統(tǒng)的基本特征。
社會(huì)系統(tǒng)的統(tǒng)一性在于其各部分之間的相互依存。
I am always glad to think that my education was, for the most part, informal, and had its roots in the soil.