In order to control the nuclear chain reaction, the reactor operators use control rods.
为了控制原子能的连锁反应，反应器的操作人员用到了控制棒。
9 SEC the control rods, made of boron and silver, are lowered, which slows down the nuclear chain reaction within the core.
9秒由硼和银制成的控制棒被降下，减慢反应堆堆芯内的核链式反应。
Fast-moving neutrons are produced by fission reaction in a nuclear reactor. Water is commonly used to moderate and control the speed of neutrons.
核电站的核反应堆中，核裂变会产生高速移动的中子，通常是用水去阻隔及控制中子的移动速度。
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