fission fragment

例句：

1. 1.The nuclear reactor was shut down due to a fission fragment.
   由于裂变碎片，核反应堆被关闭了。
2. 2.The scientist discovered a new type of fission fragment.
   科学家发现了一种新的裂变碎片。
3. 3.The fission fragment caused a chain reaction in the reactor.
   裂变碎片在反应器中引发了连锁反应。