在一个压水式反应堆里，我们用硼来控制反应率。
Now in a PWR we have essentially boron to control reactivity.
选择和控制反应过程的温度是反应器设计和控制中的重要问题。
It is very important for reactor design and control to choose and control the temperature throughout the reaction process.
一些著名的食品研究实验室已经比以前更了解控制反应过程，在反应模型能达到需要的风味。
A few well-known food research laboratories have come closer than ever before in acquiring control over the process to achieve flavor development through the application of model systems.
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