If one made a journey over the continents one would find every kind of surface including mountain ranges , plains , plateaux , deserts , tropical forestlands and empty areas covered permanently by ice and snow 如果一个人做一次大陆旅行,他会发现各种各样的地貌,包括山区、平原、高原、沙漠、热带雨林和永久性冰雪覆盖的空旷无人区。