英语语法分析

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。

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。

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.

1969年，德国研究人员兼作家埃里希·冯·丹尼肯提出，这些线条是外星人为它们的飞机绘制的跑道。