We considered a list of the best American books — but we'd need a whole issue to do them justice. Here are 5 that helped define the national character. Most from a century or so ago, they still entertain, teach and inspire American people.

    Moby-Dick by Herman Melville

    First published in 1851, the book tells the adventure stories of Captain Ahab and his continuous hunting for the white whale and draws us into a universe full of fascinating characters and stories.

    The Education of Henry Adams by Henry Adams

    Awarded the Pulitzer Prize in 1918, the book provides insight into Adams' family, including his experience as a private secretary to his father, minister to England during the American Civil War.

    Leaves of Grass by Walt Whiteman

    When Whiteman published Leaves of Grass in 1855, he wanted to define the American experience— sing for the new country in a new voice, reflecting the great changes in the American literary world that had taken place during his lifetime.

    Poems by Emily Dickinson

    An enthusiastic poet whose works have had a considerable influence on modern poetry, Dickinson's frequent use of dashes(破折号)，sporadic(零星的)capitalization of nouns, and unusual metaphors(隐喻) has contributed to her reputation as one of the most innovative poets of the 19^th-century American literature.

    The song of Hiawatha by Henry Wadsworth Longfellow

    First published in 1855, this is Longfellow's most popular and most recognized poem, showing the heroic life and death of a magic American Indian sent by the Great Spirit to guide the nations in the ways of peace.

B

    A five-year-old dog named Kelsey has been praised as a hero for helping to save the life of her owner who slipped in the snow and broke his neck.

The man, Bob, was alone when he left his Michigan farmhouse on New Year's Eve to collect firewood. Expecting a journey of only several meters, Bob was wearing just long johns (秋裤), a shirt and slippers when he went outside, although the temperature was around -4℃.

    After the accident, he was unable to move in the snow. Fortunately, Kelsey came to his assistance.

    “I was shouting for help, but my nearest neighbor is about 400 meters away, and it was 10:30 p.m.,” Bob explained. “But my Kelsey came. By the next morning, my voice was gone and I couldn't yell for help, but Kelsey didn't stop barking.”

    Bob's companion kept him warm by lying on top of him. She licked his face and hands to keep him awake. “Kelsey kept barking but never left my side,” Bob recalled. “She kept me warm. I knew I couldn't give up and that it was my choice to stay alive.”

Bob spent 19 hours in the freezing cold. When he finally lost consciousness, his dog kept barking. Finally, hearing the barking, Bob's neighbor discovered him at 6:30 p.m. on New Year's Day and called the emergency services at once. When Bob arrived in hospital, his body temperature was below 21℃. However, doctors were surprised to find that he didn't have any frostbite (冻疮). They believed it was because of Kelsey's determination to keep him warm. Dr. Chaim Colen, the doctor who treated Bob, said, “Animals can help and his dog really saved him … he was very fortunate.”

    Bob said he was “enormously” grateful for both Dr. Colen and his Kelsey. “They saved my life. They are true heroes!”

    As most people know, in the last few years, sandstorms have swept across many cities and areas of North China, polluting the air and disturbing daily lives of human beings. People look dirty and suffer many kinds of illnesses, such as breath difficulty. The sandstorm is such a serious problem that it has not only weakened the industrial and agricultural development of our country but also caused a lot of trouble to the living conditions of the Chinese people.

    Therefore, effective measures should be taken as soon as possible to stop its happening. So how should we deal with the frightening sandstorms?

    Some experts offer practical advice as follows: For one thing, more money ought to be put into tree planting and forest protection in order to keep more water on the Earth. For another, government of all countries should make laws on environment protection. For example, banning the use of throw-away chopsticks and punishing illegal tree cutting. Scientists should also study and find ways to lower the grade of its destruction and to improve the environment. As for some schools, education about sandstorms should be spread properly and timely to make more and more people attach great importance to this problem.

    How people look forward to sunny days with soft wind touching their faces now and forever! The golden days can come back so long as we try our best to protect the natural environment from today on. And the fact is that what I expect is not just a dream. There are some sweet fruits from the early efforts.

    Antaretica's ice-white environment is going green and facing other unexpected threats. Scientists say that as temperatures go up in the polar region, invading (入侵) plants and insects, including the flies, cause a major conservation threat.

    More and more of these invaders, in the form of larvae (幼虫) or seeds, are surviving in coastal areas around the South Pole, where the temperature has risen by more than 3℃ over the past three decades. Glaciers have retreated, exposing more land which has been occupied by mosses that have been found to be growing more quickly and thickly than ever before-providing potential green homes for invaders.

    “The common house flies are a perfect example of the problem the Antarctic now faces from invading species,” said Dominic Hodgson of the British Antarctic Survey. “It comes in on ships, where it exists in kitchens and then at bases on the continent. It now has an increasing chance of surviving in the Antarctic as it warms up, and that is a worry. Insects like the house flies carry bacteria that could have a deadly effect on native lifeforms.”

    The Antarctic has several native species of insects. Together with its native mosses, these are now coming under increased threat from three major sources: visiting scientists, increasing numbers of tourists and global warming. However, it is global warming that is the main driver of the greening of Antarctica.

    In 2015, more than 38,000 tourists visited Antarctica. “These tourists are often very careful about not leaving waste or having mud. But they could carry seeds or larvae on their boots when they set foot on the Antarctic,” said Hodgson.

    More and more invasive insects and plants have been found on the Antarctic and have required removal. “the insects and plants that are native to Antarctica have survived these for thousands of years,” said Hodgson. “We have got to act now if we want to save the environment.”

    "You're going to the doctor," your mum tells you. But why go to the doctor when you're not sick? Regular checkups (健康检查) are a good idea for kids. These visits happen when you're feeling fine and are sometimes called "well-child" visits because you're well.

    It's a chance for the doctor to see that you're growing and developing normally. It's also a chance for your parents to talk with the doctor about any issues, such as safety or nutrition, so they can help you stay healthy. And it gives you a chance to ask any question you might have about your health. You might wonder when you will grow taller, for example, or if you weigh the right amount.

    A checkup may start when a nurse calls you and your parents from the waiting room. He or she might start by checking your weight and height, as well as your blood pressure and maybe your temperature.

    Blood pressure: This shows how hard your heart is pumping blood throughout your body.

    Body temperature: Using a thermometer, the nurse can find out if your temperature is in the normal range. If it is higher, it means that you have a fever and your body is working to fight off an infection (感染).

    The nurse may check your hearing and vision. If you have trouble with either one of these, you might need to see a hearing expert or an eye doctor. Urine (尿) can tell whether something is wrong with the way a person's body is working.

    All of these numbers, measurements, and test results will go into your medical record, so the doctor can look them over. Then it's time to meet the doctor.

    "You can use me as a last resort(选择), and if nobody else volunteers, then I will do it." This was an actual reply from a parent after I put out a request for volunteers for my kids' lacrosse(长曲棍球) club.

    I guess that there's probably some demanding work schedule, or social anxiety around stepping up to help for an unknown sport. She may just need a little persuading. So I try again and tug at the heartstrings. I mention the single parent with four kids running the show and I talk about the dad coaching a team that his kids aren't even on … At this point the unwilling parent speaks up, "Alright. Yes, I'll do it."

    I'm secretly relieved because I know there's real power in sharing volunteer responsibilities among many. The unwilling parent organizes the meal schedule, sends out emails, and collects money for end-of-season gifts. Somewhere along the way, the same parent ends up becoming an invaluable member of the team. The coach is able to focus on the kids while the other parents are relieved to be off the hook for another season. Handing out sliced oranges to bloodthirsty kids can be as exciting as watching your own kid score a goal.

    Still, most of us volunteers breathe a sigh of relief when the season comes to a close. That relief is coupled with a deep understanding of why the same people keep coming back for more: Connecting to the community(社区) as you freely give your time, money, skills, or services provides a real joy. Volunteering just feels so good.

    In that sense, I'm pretty sure volunteering is more of a selfish act than I'd freely like to admit. However, if others benefit in the process, and I get some reward too, does it really matter where my motivation lies?