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.
结果表明，通过控制反应条件，可制得粒度分布均匀、结晶性能良好的纳米级银粉。
The results showed that well-crystallized nanometric Ag powder with even size could be prepared by controlling the reaction conditions.
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