为什么大规模营养液栽培中要进行营养液的循环流动？
Why the cycling of nutrient solution is needed in large scale nutrient solution culture?
请简要说明营养液栽培与土壤栽培在植物养分供应上的不同点。
Please show the brief differentia between hydroponics and soil culture.
对于火星，他们已经建立了所有的永久性基地驻地的元素模型(有的是数字模型，有的是实体模型)——居住地、研究实验室、营养液栽培花园、甚至还有地面探测车。
And for Mars, they've built models (some digital, some physical) for all the elements of a permanent base-living quarters, research LABS, hydroponic gardens, even the ground-exploration vehicles.
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