Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

有时我认为我们在宇宙中是孤独的，有时我认为我们不是。无论哪种情况，这个想法都相当惊人。

-- Arthur C. Clarke 亚瑟·C·克拉克