For example, in producing nuclear energy, the decay reactions repeat many times, with the imperfections of every repetition resulting in a loss of predictive power of computations. This hampers the optimization process, and is one of the main reasons why several large projects investigating energy production using more abundant Uranium-238 or Thorium (fast breeder reactors) were closed in Europe and the United States before they achieved the expected level of performance.
比如说在产生核能的过程中，裂变反应多次重复，而每次重复过程的不完全则导致释放出来的能量较预期中少。这妨碍了反应的最优化，也是欧美许多试图通过储量更丰富的铀238或钍（快中子增殖反应堆）来产生能量的大型项目在实现预期效果之前就被迫下马的原因。