The productive Labour and reproductive theory is an organic unity in "Capital" by Karl Marx.

马克思《资本论》中的生产劳动论与再生产理论是一个有机统一体。

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It's indicated that productive theory is mainly used in logical fields such as computer, physics, mathematics, but it is unusually used in chemical teaching.

绝大部分文献资料显示，产生式理论主要应用于计算机、物理、数学等逻辑性很强的领域，很少有文献资料涉及产生式理论在化学教学中的应用。

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This paper describes the metallurgical theory for Ba and the productive practice of Si-Ba series ferroalloys as well as its application to the ferrous metallurgy.

本文阐述了钡的冶金理论，硅钡系列铁合金的生产实践，以及在黑色冶金中的应用。

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The theory behind productive gossip is that evolution caused gossip to play an important role in society over thousands of years.

FORBES: Why Gossip Is Good For The Office

Pork used to mean roads, bridges and ports that, at least in theory, made the economy more productive while providing well-paid work for blue-collar workers.

FORBES: A Bailout For Yuppies