In the 21 century, the more detailed investigation of natural radiation environment evaluation was carried out in part of our country.
进入二十一世纪，我国部分省区开展系统的更加详细的天然放射性生态环境调查评价工作。
In the 21 century, the more detailed investigation of natural radiation environment evaluation was carried out in part of our country.
进入二十一世纪，我国部分省区开展系统的更加详细的天然放射性生态环境调查评价工作。
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