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.
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。
Those are also symptoms of a deficiency of B-12, a key nutrient needed to make red blood cells and DNA and keep the nervous system working right.
这也是维生素b - 12缺乏的症状，B - 12是合成红细胞和DNA、维持神经系统正常运转的不可或缺的营养物质。
One of the most essential nutrients for a better night's sleep is definitely Vitamin B6. This nutrient helps fight stress and relax your nervous system.
晚上良好的睡眠所需的最重要的营养成分之一当然就是维他命b6。这一营养可以帮助抵抗压力，放松你的神经系统。
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