Jeffrey Kluger suggested that, the completely closed space is now not the most painful factor for the astronauts to live in the space. As the long-time-exposure under the strong radiation energy can be really dangerous, or even fatal for the astronaut when their are on their track around the earth or on their voyage to the moon without the attraction of the magnetic field(18)
问一下,密封的空间我写成completely closed space,还有什么好一点的说法么?