Five million people visit Grand Canyon in the US every year. For the purpose of helping project Grand Canyon for your fellow visitors and future generations, please follow the guidelines below.

To protect the park, camping is allowed only within permitted campgrounds. Permits are required for overnight camping at the North Rim. Advance booking can be received by mail. Please write: Information Center, P. O. Box 129, Grand Canyon, AZ 86023

Because of the extreme fire danger, campfires are not allowed except at Mather and Desert View campgrounds. Collection of firewood is not allowed either.

Please stay on permitted paths. If you don’t do so, you may destroy desert plants. Pack out what you pack in, so you leave no signs of your visit. It is important to keep in mind that you are in a national park where wildlife exists.

The weather at Grand Canyon can change very quickly. With so much rock, lightning(闪电)causes a particular danger during sudden summer storms. These storms also frequently bring floods inside valleys, a danger to hikers. Watch the skies and check daily weather reports.

Do not feed park wildlife. There have been a few cases at Grand Canyon National Park where deer were purposely shot because they ate plastic bags that left them sick and weak. Hungry deer can be a danger and have kicked and bitten visitors at Grand Canyon. Some other animals will also beg and bite. For your own safety and the well-being of the animals, please do not feed wildlife, no matter how gentle they may appear.

As an adult, I like nothing better than to sit on the beach reading. If I have a satisfying reading time on the beach, I will be happy for many days. However, I'm sad to say it isn't really a thing for children. Most children would rather play in the waves or play with sand. But the truth is that even when children are on vacation, they need reading time that we, adults, look forward to. The method is getting them to sit for 5 or 10 minutes to enjoy the pleasure of reading.

Books can probably get wet or filled with sand, They are then pretty much ruined. Some book chapters (章节) may be a little long. Your children may be willing to sit for 10 minutes. However, they may be annoyed at reading if it takes longer than 10 minutes. And if your children are similar to my daughter, they are likely to love reading on the beach.

Every time I go to the beach with my daughter, I will bring a magazine for her. Generally, magazines are not too heavy. They can also be thrown away if they get wet. Besides, they provide just the right amount of reading when my daughter is ready to sit under the sun umbrella. Literary (文学的) magazines like Cricket, Spider and Ladybug will allow your children to read wonderful fiction. Discovery magazines like Click, Dig, and Faces have articles on all sorts of topics that will excite and interest your children. And like the short stories in the literary magazines, these articles have the right length (长度) for reading on the beach.

So don't leave magazines behind when you pack your bags! Put a magazine or two in the pocket of the bag and when your children need a few minutes to relax, pull it out and get them to sit for 10 minutes or so.

One day, a patient came to see me. He worked as a waiter in a restaurant and his problem was acid reflux (胃酸倒流), a disease that influences as many as 40 percent of Americans, a marked increase in recent years. Reflux can lead to esophageal (食道的) cancer, which has increased by about 500 percent since the 1970s. The drugs we use to treat reflux don't always work and may even increase the risk of developing cancer when used long term.

What is responsible for these worrying developments? For one, our poor diet, with its huge increases in the intake of sugar, fat, soft drinks, and unhealthy foods. But another important fact has been overlooked: dinnertime. Over the past twenty years, the time of my patients' evening meals has become later and later. Dinner — already pushed back by longer work hours — is often further delayed (推迟) by activities such as shopping and exercise.

In my experience, the single most important treatment for reflux is to avoid late eating. A patient with reflux came to see me because her father and uncle died of esophageal cancer, and she was afraid of getting it too. Her nightly routine (常规) included a 9 p.m. dinner with at least two bottles of red wine. The reflux was serious, and changes were needed.

She listened, then did not come back to see me for a year. “For the first two months, I just hated you,” she told me, “and for the next two months, I was having some trouble eating. I guessed I was going to die of esophageal cancer.” Then she added, “You know, we're the reason that it's not so easy to get 6 p.m. reservations (预约) at the good restaurants anymore.”

To stop the increase in reflux disease, we have to stop eating at least three hours before bed. As for my waiter patient? I told him to eat dinner before 7 p.m. Within six weeks, his reflux was gone.

Ridgewood is a small town 20 miles from Manhattan, New York. It is a quiet town, perfect for raising children away from the rapid pace of the city. However, besides hours of homework, many Ridgewood children have too many after­school activities－from swimming to piano classes. Some kids compare their life to that of a New York general manager who has an 80­hour workweek.

Children's schedules filled with homework and activities made a lot of townspeople worried, so the town decided to start a movement called “Ridgewood Family Night－Ready, Set, Relax！” The mayor (市长) made a public statement, calling for a town­wide night for families to do nothing. And schools and clubs agreed to support the movement so families could relax and get together.

Some parents like to talk about their childhood, one without so many scheduled after­school activities. As kids, they just went out to play with neighborhood friends after school. However, almost all these parents take their children to their regularly scheduled activities. These fathers and mothers feel it is their duty to make sure their children are prepared to survive in today's high­pressure work environment. They are afraid that their children can't enter the “right” universities and won't succeed in a more and more competitive world.

However, it seems that Family Night worked, at least to a certain degree. Cars moved freely around Ridgewood's normally busy downtown streets. Some families ate supper together for the first time in months. One family watched home movies of when the children were little, baked cookies and played games together.

At first, some people were excited that they could take back their lives. But sadly, few families now believe that one night will change them. Nearly all of the townspeople are sure that they will fall back into the old habit.

School is finally over, but what are you going to do now? The excitement of getting out of school can quickly turn into boredom and frustration about having nothing to do. Don't let this happen to you. Read on to find out how to make the most out of your summer vacation!

Clean your room out.     16    Clear out your clutter (凌乱的东西) for a fresh, clean start this summer.

Get outside! You've stayed inside all winter, so get out your bike and go for a nice, long ride. Invite a friend or two and go hiking.     17    . Go jogging or even just for a walk in the park.

Go camping.     18    .A yard, open field (if you're allowed), or a camp site are great places to set up camp. Try to set up camp by a lake for a lovely view and easy access to swimming grounds. Camping and swimming. What's not to love?

    19    . Borrow books from the library on how to make them, or use online resources. You don't need to spend a fortune on materials－see what's inside your house.

Get membership (会员) at your local library.     20    . Novels, magazines and non­fiction books are all there for you to read for free. Pick what you like and read on. Lots of libraries also have summer reading clubs, so consider joining one of those if you enjoy reading.