Sulfonylurea herbicide Rimsulfuron was synthesized by a five-step reaction.

经五步反应合成得到磺酰脲类除草剂玉嘧磺隆。

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The photolytic reaction might be a step reaction.

光促反应为分步反应。

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The 20-step reaction mechanism and multicomponent diffusion were applied in the simulation.

采用20步的反应机理并应用多分量扩散进行了模拟计算。

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As the name implies, the atom transfer step is the key step in the reaction responsible for uniform polymer chain growth.

FORBES: Better Science Makes Better Products

Another possibility--the most disturbing one, actually--is that the North Koreans had been telling the truth when on May 12, just two days before South Korea detected the high levels of xenon, they announced they had created a nuclear fusion reaction, a step necessary to the building of a thermonuclear device.

FORBES: Magazine Article

European leaders are set to take a vital step towards the creation of a Rapid Reaction Force of up to 60, 000 personnel.

CNN: Europe bites bullet with defence force