Bestselling Swiss author Erich von Daniken believed they were built by stranded extraterrestrials.
瑞士畅销书作家埃里希·冯·丹尼肯认为它们是由受困的外星人建造的。
2
This trend towards dealing with extraterrestrials as nearly equals, is encouraging progress for the human race.
这种以近乎平等的态度对待外星人的趋势，正鼓励着人类种族的进步。
3
One answer appeared in 1969, when the German researcher and writer Erich von Daniken proposed that the lines were drawn by extraterrestrials as runways for their aircraft.