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.

    Bill was a boy of 15. His parents didn't care about him. Bill often slept in class and always failed in his exams. Neither his teachers nor his classmates liked him.

    One day, Miss Jones, a new teacher, came to Bill's class. She began her lesson. She asked a question. "I'd like the smartest boy to answer my question. ''Then she said loudly, "Bill, please!”

    Bill was surprised. And he stood up without a word.

    "Just try it! I believe you can!" She encouraged(鼓励)Bill.

    After school, Miss Jones had a long talk with Bill. She told him that she cared about him and believed in him.

    Bill thought a lot that evening. From then on, he worked hard and Miss Jones helped him with his homework in the afternoon. She even cooked for him.

    Later, Bill had another exam. He was very excited to pass the exam. A change took place in Bill's heart.

    I was going back to work to finish a few things one evening, and my two children were busy sewing（缝纫） things on the sewing machine. My 11-year-old daughter was going to help her older brother make a little cushion（垫子）. I left and in a few hours returned to find a mess in the kitchen and front room while both children were sitting in front of the television. Having had a long day, I was very short with my greeting to them. But then I noticed the material they had used for the cushion. I had bought it to make a blanket. Not stopping to listen to them, I shouted at the children and explained how angry I was at what they had done.

    My daughter listened to me sheepishly, not trying to say anything to herself at all, but the pain could be seen written across her face. She went to her room quietly and spent some time alone before she came out to say good night and once again apologized for the mistake she had made. A few hours later, as I was preparing to go to bed, there on my bed lay a beautiful little cushion, with the words “I LOVE MUM”. Next to it was a note apologizing again.

    To this day, I still get tears in my eyes when I think of how I reacted and still feel the pain of my actions. It was I who then sheepishly went to her and apologized for my actions. I display the cushion on my bed with great pride and use it as a constant reminder that nothing in this world is greater than a child's love.  

    When you are ill, you should go to see a doctor. After the doctor looks you over, he will write you a note to take to the chemist for some medicine. Chemists are usually good at reading doctors' notes. But sometimes doctors write too badly and even the chemist can not read them.

    One day a woman wrote to a doctor to invite him to have dinner with her family in the restaurant. The doctor wrote an answer, but he wrote too badly and the woman could not read it. "What shall I do?" she asked her husband, "I don't know whether he is going to come or not. I don't want to call and say that I don't understand him."

    Her husband thought for a few minutes and then he had an idea. "Take it to the chemist," he said, "He will be able to read it for us."

    "Thank you," the woman said, "That's a good idea." She went to the chemist's shop and gave the doctor's note to him. The chemist looked at it for a long time.

    "Could you wait a moment, Miss?" he said. Then he went to the back of the shop. After a few minutes he came back, carrying a large bottle. He gave the bottle to the woman.

    "Take one spoonful(一匙) every day." He told the woman.