【翻译讲解】
1. 徐霞客一生周游考察了十六个省，足迹几乎遍及全国。
周游：到各处游历; 走遍travel across (around)；tour；visit
考察：explore; make an on-the-spot investigation; inspect
足迹：footprint;footmark; trace
遍及：spread all over
【译文】During his life time, Xu Xiake visited and explored 16 provinces, leaving his footprints in nearly every corner of the country.
2. 他在考察的过程中，从来不盲目迷信书本上的结论。
他在考察的过程中:in his exploration; in his tours；on his tours
盲目：blindly; in a blind way; without thinking
迷信：superstition; blindly worship/ believe in。
这里“迷信”指接受，accept readily/without thinking
【译文】He never blindly accepted the conclusions given in books in his exploration.
3. 他发现前人研究的地理的记载有许多不很可靠的地方。
前人：predecessor; forefathers; others
前人栽树，后人乘凉：One man sows and another reaps.
记载：record; put down in writing; document; notes
可靠：真实可信 true或准确accurate信得过reliable; trustworthy
【译文】He found many inaccuracies in the travel notes on geography written by his predecessors.
He found that many of the geographical records by other people before him were inaccurate.