• 1. the nitrogen cycle: 氮循环 | 氮素循环 | 循环
• 2. Managing the nitrogen cycle: 氮循环管理

• 1.The three most important nutrient recycles are the nitrogen cycle, the carbon cycle and the one we are going to talk about today, the Phosphorus cycle.
  这三种最重要的营养循环包括氮循环、碳循环和我们今天要讲的磷循环。
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• 2.You said that the nitrogen cycle is also an important nutrient cycle.
  你说了，氮循环也是一个重要的营养循环。
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• 3.No Dickensian insights are necessary to appreciate the scale of human intervention in the nitrogen cycle.
  在理解人类对氮循环的干扰力度方面，并非是杞人忧天。
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