?铀族放射系
... 天然放射系母体 Natural Parent 铀族放射系 radioactive uranium chain 天然放射系 natural radioactive series ...
In Japan in 1999, an uncontrolled nuclear chain reaction at a uranium-reprocessing plant killed two employees and spewed radioactive neutrons over the countryside.
WSJ: Nuclear Issues Put Focus on Japan Regulators
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。