But at least the current crop of graduate high-flyers are likely to spend their careers doing something more productive and permanent than trading financial derivatives.
但至少，眼下这一茬雄心勃勃的毕业生在踏上社会后，可能会致力于比较易金融衍生品更有建设性、更长远的事业。
This is an approach to crop production that is based on three principles: permanent soil cover, minimum soil disturbance, and crop rotations or crop associations.
保护性农业是一种作物生产手段，它基于三个原则：永久性土被，最低土壤干扰，以及轮作或作物关联。
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