Three-dimensional flow field in the elutriator of polythene packed system is simulated.
模拟了聚乙烯填充体系淘析器内的三维流场。
Secondly, they devised the narrow-strip, three-field farming system which continued to the 18th century.
其次,他们设计的窄条三圃田农耕制延用至18世纪。
Ancestral hall, clan pedigree and clan field are three marks of modern family system.
祠堂、族谱、族田是近世家族制度的三项标志。
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