rem roentgen equivalent man 人体伦琴当量
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。
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)。
Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged.
科学家们有理由认为人可以忍受远超过0.1雷姆的辐射而不受伤害。
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