徐霞客一生周游考察了16个省，足迹几乎遍及全国。他在考察的过程中，从来不盲目迷信书本上的结论。他发现

参考答案:
In his lifetime Xu Xiake traveled sixteen provinces, almost all over China, for exploration. Never blindly following the conclusions in books during his exploration, he was able to discover many a place that had been quite unreliably recorded by the forerunners in their geographical studies. For a truthful and detailed investigation, he rarely traveled by road or by water. Instead, he trekked over mountain after mountain. In order to verify the truth of nature, he always chose such mountain areas with difficult and dangerous paths and sparsely populated forests to travel and explore that he discovered many wonderful mountains and beautiful scenery. He used to select different times and seasons to revisit the famous mountains in various parts of China so as to make repeated observations of the shifting breathtaking scenes.