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。

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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。

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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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The current system allows teams to field three overage players at the Olympics alongside a squad of under-23 players, which means top internationals like Wayne Rooney will now be cleared to play for their countries at London 2012.

BBC: Olympic football keeps under-23 rule as Fifa relents