The radiation comes from space (cosmic rays) as well as natural radioactive materials found in the soil, water and air.
辐射来自于外层空间（宇宙射线），以及在土壤，水和空气中的天然放射性物质。
In space men lack the air needed for breathing, the pressure required to stop their blood from boiling and the natural protection of the atmosphere against radiation.
在太空，人们缺乏呼吸所必需的空气，缺乏能抑制血液沸腾的压力以及抗辐射的大气的自然保护。
The analysis demonstrates that the conduction, convection and radiation heat transfers occur in the system while the laminar flow and natural flow exist in the closed space.
分析表明系统中存在传导、对流及辐射传热，其中封闭空气夹层又存在层流自然对流。
The analysis demonstrates that the conduction, convection and radiation heat transfers occur in the system while the laminar flow and natural flow exist in the closed space.
分析表明系统中存在传导、对流及辐射传热，其中封闭空气夹层又存在层流自然对流。
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