Abstract: With the prolongation of space flight,influences of various aerospace environmental factors on the astronauts become more and more severe,while ultraviolet radiation is lacking.是什么意思_Abstract: With the prolongation of space flight,influences of various aerospace environmental factors on the astronauts become more and more severe,while ultraviolet radiation is lacking.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句