1、不难理解高速旅行给身体带来的不适。

It's not difficult to understand the discomfort which high-speed traveling brings to our body.

2、引起这一不同的原因之一是不同的人体活动由不同的因素控制。

One of the reasons for this difference is that different body activities are controlled by different factors.

3、食物中的蛋白质使人兴奋，而食物中的碳水化合物使人易于入睡。

Proteins in food make people wake for while，and carbohydrates make them fall asleep easily.

4、时差反应是每一个国际旅行者可能遇到的问题。

Jet lag is problem which every international traveler may encounter.

5、等待几天直至身体的调节机制自然适应新时区，这并不可行。

It's not feasible to wait several days until the holiday regulatory mechanism has adapted to the new time zone.