reactor of various shapes

例句：

1. 1. The reactor is the heart of the nuclear power plant.
   反应堆是核电站的核心。
2. 2. The reactor is a complex machine that produces electricity.
   反应堆是一个复杂的机器，用于产生电力。
3. 3.The reactor was shut down due to safety concerns.
   由于安全担忧，反应堆被关闭了。