The method of the definite integral by substitution is one of the main techniques among the definite integral calculation.

定积分换元法是定积分计算的主要方法之一。

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A specialized domain, such as programming phrases, can be introduced by substitution anywhere that the root elements are allowed.

专门的领域，如编程惯用语，可通过在任何允许根元素的地方进行置换来引入。

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Doxofylline was synthesized from theophylline by substitution, oxidation and condensation. The structure has been proven by IR and MS.

以茶碱为原料经取代、氧化和缩合反应制备多索茶碱；其结构为IR及MS所证实。

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Improving facilities, teaching quality and research takes money, and while schools theoretically could "aggressively try to increase their efficiency, reduce costs and get better by substitution rather than by growing expenditures, they don't do this, " Ehrenberg says.

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The current best known superconductors have the unique property of evolving out of parent large gapinsulators on the introduction of charge carriers by chemical substitution, providing a clue to the discovery of new families of superconductors.

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Zaher proved a wise substitution by Mohamed Abdallah, who doubles as national coach, scoring just three minutes after replacing veteran striker Haytham Tambal at Gwanzura Stadium.

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