生态学家对磷循环进行了大量研究，因为如我所说，磷是一种重要而不充足的营养物质。
The Phosphorus cycle has been studied a lot by ecologists because like I said, Phosphorus is an important nutrient and it's not so abundant.
这个生态系统是生物圈中令人着迷的悖论之一：清澈而又缺乏营养的水域是如何支撑如此多产的群落的？
This ecosystem is one of the fascinating paradoxes of the biosphere: how do clear, and thus nutrient-poor, waters support such prolific and productive communities?
由于养分的重要性和贫乏性，营养循环是我们在这门课中会讲到的最重要的生态系统过程之一。
Because of the importance of nutrients and their scarcity, nutrient recycling is one of the most significant eco-system processes that we'll cover in this course.
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