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?
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？
2
Brazilian land is like Africa's: tropical and nutrient-poor.
巴西土地状况和非洲一样：热带气候，土地缺乏养份。
3
At best, they contain nutrients, such as phosphorus, which gave our nutrient-poor ancestors a little more energy.