In fact, the three codes are standard ones extensively used worldwide for decades in nuclear reactor engineering design, nuclear reactor radiation shielding safety analysis and other fields of nuclear energy research.

• 事实上，这三个程序是国际上近几十年来在核反应堆工程设计、核反应堆辐射屏蔽安全分析等核能研究领域中广泛应用的标准程序。