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。
Its lawmakers gave preliminary approval last week to a law that would make it a crime to employ ultra-thin models on runways.
