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.

    Baloo the bear, Leo the Lion and Shere Khan the tiger have the most unusual and unlikely friendship between them. They were saved eight years ago, when they were cubs only two months old.

    They were first sent to a rescue（救护）center, where they were raised together. Now they are in an American zoo. Because they came here as a kind of family, the zoo built a large clubhouse so that they could all sleep in it.

    Now they have grown up. You can see them playing around like brothers. The three big animals seem to no sense(意识) of their animal differences.

    Baloo and Shere Khan are very close. That is because they rise early, as Leo being a lion likes to spend most the day sleeping. When Leo wakes up the three of them mess around for most of the day before they settle down to some food. It is wonderful to see a giant American Black Bear put his arm around a Bengal tiger and then to see the tiger touch the bear with his nose lightly like a pet cat. You can often see they lie on top of each other for heat and for love.

    “They are not wild animals any more. But you must remember who you are dealing with when you are with them,” said one of the zoo keepers.

    After some time, another official climbed up to the platform and spoke to me. From his signs I understood that they were going to move me. The King of this country（which was called Lilliput）had ordered his people to carry me to the capital city, about a kilometre away. I made signs to ask whether(是否) I could be untied, but the official politely said "No". While I was eating bread, a platform had been prepared to carry me. The people of Lilliput, known as the Lilliputians, are very clever with their hands. For me, five hundred men built a special wooden platform with twenty－two wheels. Nine hundred of the strongest men worked for about three hours to lift me on to the platform, and one thousand five hundred of the King's largest horses（each eleven and a half centimetres high）pulled me to the capital. I did not know about any of this, because they had put a sleeping powder in my wine, and I was in a deep sleep. (An Extract from A voyage to Lilliput )

    Nigel is our new next-door neighbour. He's a pilot. He was in the R.F.A. He will fly to New York next month. The month after next he'll fly to Tokyo. At the moment, he's in Madrid. He flew to Spain a week ago. He'll return to London the week after next. He's only forty-one years old, and he has already been to nearly every country in the world. Nigel is a very lucky man. But his wife isn't very lucky. She usually stays at home!