This paper has also calculated great production potential of the two levels of the pratacultural system.
具体计算了草业系统两个层次的巨大生产潜势；
Pratacultural science researches the grassland agro-ecosystem, mainly looking at 3 elemental groups, 3 main interfaces and 4 production levels.
草业科学是研究草地农业生态系统的科学，主要研究对象是3个要素群，3个主要界面和4个生产层。
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