With such a vehicle, astronauts could explore a much larger area of the moon's surface.

VOA: special.2009.07.29

That is the lowest point on the earth's land surface so this dramatic drop in just a very short geographical area.

这是地球陆地表面的最低点,这急剧下降是在很短的地理范围内。

耶鲁公开课 - 旧约导论课程节选

This would depend on the total surface area of roofs in a city.

VOA: special.2010.03.02