1. In that case, you can use the rem unit.
在这种情况下,你可以使用rem单位。

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2. At one extreme, the scientists estimated fly ash radiation in individuals' bones at around 18 millirems (thousandths of a rem, a unit for measuring doses of ionizing radiation) a year.
在极端情况下,科学家估计浮尘的放射性在个人的骨骼中的积累可以达到每年18毫雷姆(千分之一雷姆,衡量电离辐射剂量的单位)。

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3. The average American receives 360 millirems of radiation each year, 300 from natural sources and 60 from man-made activities. (a rem is a unit of radiation exposure.)
平均一个美国人每年要受到360毫雷姆(毫雷姆:核辐射量单位)的辐射,其中300毫雷姆来自自然界,60来自人类活动。

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4. The average American receives 360millirems of radiation each year, 300 from natural sources and 60 from man-made activities. (a rem is a unit of radiation exposure.)
平均每个美国人每年接收360毫雷姆的射线,其中300毫雷姆来自自然放射源,60毫雷姆来自人类活动(雷姆是射线强度单位)。

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5. The average American receives 360millirems of radiation each year, 300 from natural sources and 60 from man-made activities. (a rem is a unit of radiation exposure.)
平均每个美国人每年接收360毫雷姆的射线,其中300毫雷姆来自自然放射源,60毫雷姆来自人类活动(雷姆是射线强度单位)。

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