On a hill 600 feet above the surrounding land, we watch the lines of rain move across the scene, the moon rise over the hills, and the stars appear in the sky. The views invite a long look from a comfortable chair in front of the wooden house.

    Every window in our wooden house has a view, and the forest and lakes seldom look the same as the hour before. Each look reminds us where we are.
    There is space for our three boys to play outside, to shoot arrows, collect tree seeds, build earth houses and climb trees.

    Our kids have learned the names of the trees, and with the names have come familiarity and appreciation. As they tell all who show even a passing interest, maple (枫树) makes the best fighting sticks and white pines are the best climbing trees.

    The air is clean and fresh. The water from the well has a pleasant taste, and it is perhaps the healthiest water our kids will ever drink. Though they have one glass a day of juice and the rest is water, they never say anything against that.

    The seasons change just outside the door. We watch the maples turn every shade of yellow and red in the fall and note the poplars' (杨树) putting out the first green leaves of spring. The rainbow smelt fills the local steam as the ice gradually disappears, and the wood frogs start to sing in pools after being frozen for the winter. A family of birds rules our skies and flies over the lake.

Wilderness

    "In wilderness(荒野) is the preservation of the world." This is a famous saying from a writer regarded as one of the fathers of environmentalism. The frequency with which it is borrowed mirrors a heated debate on environmental protection: whether to place wilderness at the heart of what is to be preserved. 

    As John Sauven of Greenpeace UK points out, there is a strong appeal in images of the wild, the untouched; more than anything else, they speak of the nature that many people value most dearly. The urge to leave the subject of such images untouched is strong, and the danger exploitation(开发) brings to such landscapes(景观) is real. Some of these wildernesses also perform functions that humans need—the rainforests, for example, store carbon in vast quantities. To Mr.Sauven, these "ecosystem services" far outweigh the gains from exploitation.

    Lee Lane, a visiting fellow at the Hudson Institute, takes the opposing view. He acknowledges that wildernesses do provide useful services, such as water conservation. But that is not, he argues, a reason to avoid all human presence, or indeed commercial and industrial exploitation. There are ever more people on the Earth, and they reasonably and rightfully want to have better lives, rather than merely struggle for survival. While the ways of using resources have improved, there is still a growing need for raw materials, and some wildernesses contain them in abundance. If they can be tapped without reducing the services those wildernesses provide, the argument goes, there is no further reason not to do so. Being untouched is not, in itself, a characteristic worth valuing above all others.

    I look forwards to seeing these views taken further, and to their being challenged by the other participants. One challenge that suggests itself to me is that both cases need to take on the question of spiritual value a little more directly. And there is a practical question as to whether wildernesses can be exploited without harm.

    This is a topic that calls for not only free expression of feelings, but also the guidance of reason. What position wilderness should enjoy in the preservation of the world obviously deserves much more serious thinking.

    Mark was a great kid from a tough neighborhood. Crime, drugs, fighting and poverty: You name the problem and his neighborhood had it. A scholarship fund provided his tuition to Catholic High, where he was a great baseball player.

    Mark struggled in the classroom, though. He was bright, just behind, due to a more than difficult home environment. But there were problems finding the time for all he needed to do. After-school tutoring seemed impossible because of baseball practice. Some suggested Mark abandon sports and concentrate on “schooling”. But, in reality, if he was going to attend college he would need his sports; so to miss practice and then perform any less than at his best on the field was not wise.

    A fellow teacher, Mrs. Jones, offered to tutor Mark in math at her home. I asked Mark to come to my house for other areas of work. No one paid us. Mrs. Jones summed it up this way: “Pay day doesn't always come on Mondays”.

    When we were not working with Mark to improve his skills for the ACT, the coach and Mark's dad took him to various colleges to talk with both baseball and football program coaches. He settled on the college that offered him scholarships to play both sports. But he needed a good ACT score.

    It takes months to receive the results of college entrance exams. One afternoon after school, while I was grading papers in my room, there was a noise outside the door.

    Mark came in, lifted me out of the seat behind my desk, spun(旋转) me around in the air, and yelled over and over: “I'm going to college! I'm going to college!”

    “I guess you got your scores!” I asked.

    “Well, yeah!” he laughed. “And guess what? I got one point more than I need to be admitted. One point extra. Thank you! Now, where's Mrs. Jones? I've got to tell her too!”

    Until that moment, I had never quite understood what the expression “Pay day doesn't always come on Mondays” meant. But it was clear to me the instant Mark ran into the room to announce his news. No amount of money could ever replace my spin in the air at the hands of a boy who finally had a chance at a better life.

    You may probably meet most of the powerful graduation speakers, here who are well-known people in their fields. I think the schools couldn't have picked better speakers than them, because they set good examples, deeply inspiring us in our daily life.

    1）Steve Jobs, Stanford University:

   "Remembering you're going to die, and the best way I know is to avoid the trap of thinking that you have something to lose. There is no reason not to follow your heart. Your tine is limited, so don't waste it living someone else's life. Don't let the noise of others' opinions drown out your own inner voice. …"

    2）Oprah Winfrey, Stanford University：

   "I consider the world, this Earth, to be like a school. And the secret I've learned to get ahead is being open to the lessons from the grandest universe of all. Don't react against a bad situation. And the solution will arise from the challenge. So don't give up easily, acting with responsibility. …"

    3）Bono, University of Pennsylvania：

   "For four years you've been buying, trading, and selling everything you've got in his market-place of ideas. Your pockets are full, even if your parent's are empty, and now you've got to figure out what to spend it on…The world is more flexible than you think and it's waiting for you to hammer it into shape…"

    4）Michael Del, University of Texas at Austin;

   "Now it's time for you to move on to what's next and obtain your desire. But you much must not let anything prevent you from taking those first steps. Don't spend so much time trying to choose the perfect opportunity, or sometimes you'll miss the right opportunity. Recognize that there will be failures obstacles. But you will learn from your mistakes and the mistakes of others."

    A smile will tell people around you that you are a kind and friendly person. However, many people don't smile because they think they have ugly teeth. For example, one of my classmates, Mike, doesn't have very nice teeth, so that is why he seldom opens his mouth. He even says that he has lost confidence because of his teeth. So it is very important for us to look after our teeth. In fact, a lot of people have this problem. Some people inherit tooth problems from their parents, while others' teeth are damaged because of bad habits, like heavy smoking, eating too much sugar or not brushing teeth often. If your teeth are in bad shape, you should see a dentist and ask for help. They can help improve your teeth and tell you how to take care of them.

    Smiling can help you feel more confident and make people think of you as a more friendly person. If you want to keep healthy, you should not only smile but also laugh. An Indian doctor called Kataria said that young children should laugh about 30 times a day, while adults should laugh between 7 and 15 times a day. So please take this chance to smile and laugh now.

    A typical child plays many roles, such as friend, neighbor, son or daughter. Simply reminding children of that fact can lead to better problem-solving and more flexible thinking, according to new research from Duke University.

    Better problem-solving was just one positive finding of the study, said lead author Sarah Gaither, an assistant professor of psychology and neuroscience at Duke. After thinking about their own various identities, children also showed more flexible thinking about race and other social groupings—a behavior that could be valuable in an increasingly diverse society.

    In a series of experiments, Gaither and her colleagues looked at 196 children, ages 6 and 7. In an experiment, one group of children was reminded that they had various identities, such as son, daughter, reader or helper. A second group of children was reminded of their multiple physical attributes, such as a mouth, arms and legs. All the children then needed to handle a few tasks

    Children who were reminded of their various identities showed stronger problem-solving and creative thinking skills. When shown pictures of a bear staring at honey-filled beehive(蜂窝)high up in a tree, these children had more creative ideas for how the bear might get the honey, such as turning over a bowl so that it became a stool(凳子). In other words, they saw a new use for the bowl. Children who were reminded of their multiple roles also showed more flexible thinking about social groupings. When asked to categorize different photos of faces, they suggested many ways to Spso. They identified smiling faces such as unsmiling ones, and old and young faces. The other children, meanwhile, primarily grouped people's faces by race and gender(性别).

    The-study suggests ways to promote flexible thinking for the young, which could be especially valuable for teachers." Gaither said.

    "We have this tendency in our society to only think about ourselves in connection with one important group at a time," Gaither said. "When kids think that they have various identities, they show greater abilities."