Traveling is one of the most important activities and people have been interested in it for many years.Modern traffic develops fast，so traveling to different places has become much easier than before. Staying healthy while traveling can make your trip happier.But do you know how to keep healthy during a trip？The following information may be useful for you. Before traveling： ●Wear comfortable shoes，a hat and sunglasses. ●Take some necessary medicine with you.They can be used when you get sick or have other problems. ●If you do lots of sports like walking or climbing during your trip，you should do some exercise for weeks or months before you leave. While traveling： ●Be sure not to eat dirty food or bad fruit. ●Have enough time to take a rest during your trip. ●Tap water is not safe，so drink bottled water and always clean the cover on the bottle. The passage mainly talks about______.