安全壳内的空气具有相当的辐射性，工作人员最多只能曝露5个小时，否则就超过安全范围。
Its air has been so radioactive, a worker could be exposed only five hours before exceeding a safe limit.
在处理辐射性废弃物方面已进行了大量的研究工作。
Much research has been done on the disposal of radioactive wastes.
在处理辐射性废弃物方面已进行了大量的研究工作。
Much research has been done on the disposal of radioactive wastes.
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