https://pbs.twimg.com/media/GMLWOe5bQAAN_sx?format=jpg&amp;name=4096x4096 https://pbs.twimg.com/media/GMLWR57aMAAwYwO?format=jpg&amp;name=4096x4096可背圓周率

後面那個核材料半球要達到臨界值了