... 背景辐射（Background Radiation） 人造辐射（Man-made Radiation） 辐射疾病（Radiation Sickness） ...
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man-made radiation belt 人造辐射带
One clear trend stands out: Mental distress tends to linger longer after man-made disasters, like an oil spill or radiation leak, than after purely natural ones, like a hurricane.
一个突出的趋势是：人为灾难，像石油泄漏和辐射泄漏，造成的心理疾病比自然灾害，像飓风，导致的精神压力持续时间更长。
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。
Radiation also is released from man-made sources such as X-ray machines, television sets, and microwave ovens.
X光机、电视机、微波炉等是人造的辐射来源。
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