When you watch 3D movies or TV, you have to wear a special pair of glasses. The 3D glasses make the images from the screen look like they are there in the room with you.

    Three-dimensional, or 3D, means having three dimensions（维度）: width, height and depth. 3D technology（技术） is based on the way the human brain（大脑） and eyes work. Because the pupils of a person's eyes are about 6.5era apart（分开）, when we look at something, each eye sees,it from a different angle（角度）. Our eyes send the two images to our brain, and the brain puts them together. The small difference between the image from the right eye and the image from the left eye allows us to see depth.

    When we view pictures and television in two dimensions, each eye gets the same information. That is because the image has no real depth, and there is only one of viewing it. So the goal of 3D technology is to get a different image into each of the viewer. It uses two film projectors. One projects a left eye image and the other projects a right image. The 3D glasses allow us to see a different image in each eye.

    While watching 3D films, we feel that we are in the same environment as the things we're watching. However, it also has its disadvantages. The 3D glasseswork by controlling the amount of light that reaches the eyes. It makes the screen look darker. What's more, people with eye problems may get headaches if they spend too much time watching 3D movies，because their brains need to work harder to "read" the images.

    It was a cold snowy morning after the winter vacation. And it was my first day at my new school. I was walking alone slowly and worrying about lots of things. It was early and there weren't many people on the road. Suddenly a girl who was riding a bike on ice fell down. She was trying hard to get up but fell again. Without thinking, 1 went over and helped her. She said" thank you" with a smile and then rode away. Her words warmed me a lot.

    Finally, I got to school. The teacher led me to the classroom and introduced me to the class. Then he asked me to sit down beside a girl. I felt so nervous that I didn't dare to look at her. Soon the first class, English, started. Their textbooks were different from those in my old school. As I was wondering what to do, an English book appeared in front of me. "Let's share," the girl beside me said. "Hi, I'm Carrie." I looked up. It was the girl I helped this morning. Later on, we became good friends.

    From that I learned: To help others is actually to help ourselves!

    “Homestay is a form of study abroad program．It allows visitors to rent a room from a local(当地的)family to better understand the local lifestyle．It also helps to improve the visitor's language ability，"said a teacher during a school meeting last term．“Students who wish to learn more about foreign cultures or to get foreign experience should join this kind of holiday．I am sure you won't be disappointed(失望的)．”

    After this special meeting，I always thought about this kind of holiday．Last month I had a chance at last to go on such a holiday with some of my schoolmates and we went to London．a place where I had wanted to go since years ago．

    As we were still young，we had a group leader who planned things for us and looked after us．After we got to London. we went to stay with different families．I was lucky that my host family(寄宿家庭)was a white couple who had a daughter about my age．They treated me as a daughter of their family during my stay there．They were interested in me and I learnt a lot of things from them，too．

    The holiday was filled with activities every day．After breakfast，a local teacher would come to take us in his car．Then we would have classes or go on a sight—seeing trip to different places of interest like the Big Ben，the London Bridge，and the Buckingham Palace．We would go back to our own homes after the activities．

    The holiday was a valuable experience for me．I enjoyed every minute of it．Yet，time really flew fast．Three weeks later，we had to leave “home” for Hong Kong．

We all know it's important to encourage children's interests. But Maryland mom Charmaine Britt took support to a whole new level when she gave her daughter Breana Britt the green light to start her own baking business five years ago—- when "Bree" was just 12 years old. "She kept asking me, so I finally said, 'Well, you can start it online with you baking and me doing deliveries(运送)and we'll see how it goes,'" Charmaine, 38, said.

    Things went well. The now 17-year-old Bree's Sweet Treats had grown from a little online cupcake-and-cookie business became a full-service bakery plus café that delivers to the entire Washington, D.C., Maryland, and Virginia area. "She makes great baked goods so I just thought it could be a good way to help her become financially responsible," says Charmaine. "I never thought it would become this."

    Bree, on the other hand, said she never had any doubts. "I love doing this," says the junior. "And I just think, if I'm doing something I love, I may as well make money." Bree makes about $1,500 a month.

    "When we opened the store I took some time and thought: Is this what I want?" Bree says. "And it was." She admits there have been rough patches (困难时期). There have been times where we get frustrated（受挫）. Am I willing to give up a bit of time with friends for this?" She says. "But I never regretted having this business. It's been a part of me for so long."

    Charmaine is already thrilled with what her daughter has accomplished. "over the years I've seen her become a leader and I'm so impressed with her dedication (奉献), especially for someone her age." says the mom.

    Alfred Nobel, the great Swedish inventor and engineer, was born in Stockholm on October 21, 1833, but moved to Russia with his parents in 1842, where his father, Immanuel, made a strong position for himself in the engineering industry. Immanuel Nobel invented landmines and made a lot of money from the government during the Crimean War(克里米亚战争), but went bankrupt soon after. Then, the family returned to Sweden in 1859, where Alfred began his own study of explosives in his father's lab. He had never been to school or university but had taught himself, and by the time he was twenty, he became a skillful chemist and excellent linguist, speaking Swedish, Russian, German, French and English. He built up about 100companies in 20 different countries. He was always searching for a meaning to life. He spent much time and money working on how to end the wars, and the peace between nations, until he died in Italy in 1896. His famous last will, in which he left money to provide prizes for outstanding work in physics, chemistry, physiology or medicine, literature and peace, is a memorial to his interests and ideas. And so, the man is remembered and respected long after his death.