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。
In the United States, a person typically gets a total of 6.2 millisieverts because of medical diagnostic procedures and other man-made sources of radiation.
在美国，由于医学诊断程序和其他一些人造辐射源，一个人通常会接触到共6.2毫西韦特。
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)。
Skeptics of man-made global warming from the burning of fossil fuels have often pointed to solar radiation as a possible cause of a warming Earth, but they are in the minority among scientists.
人为气候变暖说怀疑论者常常把全球变暖归咎于太阳辐射的增强而非化石燃料的过量使用，但很少有科学家认同这一点。
The radiation damage induced-by energetic particles and photons is one of the main reasons of degradation or even failure of electronic systems in man-made and space radiation environment.
在人为和空间辐射环境中，高能粒子和光子引起的辐射损伤是电子系统性能退化甚至失效的主要原因之一。
Put Beipeng plastic extruded board on roofing waterproof layer so that the waterproof layer is protected from damage by temperature difference, ultraviolet radiation, external or man-made impact.
把北鹏挤塑板放置于屋面防水层之上，使防水层免受温差、紫外线和外界或人为撞击的破坏，从而保护防水层。
Put Beipeng plastic extruded board on roofing waterproof layer so that the waterproof layer is protected from damage by temperature difference, ultraviolet radiation, external or man-made impact.
把北鹏挤塑板放置于屋面防水层之上，使防水层免受温差、紫外线和外界或人为撞击的破坏，从而保护防水层。
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