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时间——放射性尘降物的辐射强度衰减很快。
Time - fallout radiation loses its intensity fairly rapidly.
youdao
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这种影响的强度随到源的距离指数地衰减。
The strength of the influence declines exponentially with the distance from the source.
youdao
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这种影响的强度随到源的距离指数地衰减。
The strength of the influence declines exponentially with the distance from the source.
youdao