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the next three presentations addressed the question whether cells, bacteria and other microorganisms could be detected outside the earth's atmosphere and, if so, whether they could be of extraterrestrial origin.
44. 接下来的三项专题介绍述及的问题是,有否可能在地球大气层以外之处发现细胞、细菌和其他微生物,如果是可能的,那么它们是否可能源自地外。