Great as is the force at work, ages are required to produce a range of mountains like the Cordilleras; moreover, progress is not uniform and subsid ence may alternate with elevation. 李贝.西洋科学史.
From this point he set out on foot to explore the Cauca Valley and the Cordilleras. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.