1. At one time or another, they have been explained as Inca roads, irrigation plans, images to be appreciated from primitive hot-air balloons, and, most laughably, landing strips for alien spacecraft.
曾几何时，这些路被解释为诸如印加之路、灌溉植物、原始热气球的图解，甚至最为可笑的一种解释是，外星飞船的着陆点。
1. Aircraft and pilots often have to contend with bad weather and difficult landing strips in the Himalayan nation.
2. For Nanfang and Zhujiang hospitals, nearby school playground are used as landing strips.