Probably the most common reason for travel is associated with our physical well-being.
或许，旅游最常见的理由是和我们的身体健康有关的。
In the fast-moving modern society where strain and stress have become part of an individual's life.
在迅速发展的现代社会中，紧张和压力已成为个人生活的一部分。
where引出定语从句，修饰名词 society,此处 where 的意思为 in/at which,如：
This is the very hotel where the president stayed when he was visiting China. 这就是总统在访问中国期间住过的宾馆。
Don't worry, we'd look for some large enterprises where your work will be appreciated.
别担心，我们会寻找一些欣赏你的工作的公司。
It was the desire for knowledge that was the reason for the growth of the Grand Tour.
大旅游发展的原因正是由求知欲引起的。
the Grand Tour是指旧时英国贵族学生赴欧洲大陆作为最终学程的大旅游。
So far as a pious religious believer is concerned…
就虔诚的宗教信仰者而言
the historical sites associated with Christ in Israel
以色列的一些与基督教有关的遗迹
Two other elements are essential before one will seriously consider planning a trip
在一个人认真考虑制定旅游计划之前，另外两个基本要素是要考虑的。
动词consider 后跟动名词作宾语，而不能用不定式。常见的此类动词还有：suggest,finish,enjoy,mind,admit,fancy,excuse,deny, require,avoid等
Smaller family size and an increase of women in the labor market have made today's family more affluent, which greatly promotes the tourist industry.
家庭规模的变小和劳动力市场上女性的增加使得今天的家庭更富裕，从
而大大促进了旅游业。
which引出的是非限定性定语从句，修饰整个句子，如：
They turned a deaf ear to our demands, which enraged
all of us very much. 他们对我们的要求置之不理，这使我们都非常生气。