Digital camerasAccording to a standard definition, a digital camera is a camera that produces digital images that can be stored in a computer, displayed on a screen and printed. Years ago, people used to possess two different devices in order to take pictures and make videos. The creation of digital cameras was motivated mainly by two factors. First, need to spare space. Second make it more comfortable for people to do both things with higher quality results. the multi-functionalism of digital cameras and combination of several devices in one make it a popular choice for a modern man. For years a digital camera has been unaffordable for many families. However, the variety of digital cameras and various prices nowadays make it possible for almost every single family to buy a digital camera. With increasingly fierce competition, the digital camera manufactures satisfy customers with lower prices but best quality standards.The migration of birdsThe most obvious feature of birds is that they can fly. This facility gives them great mobility and control over their movements. Many species can travel quickly and economically over long distances, up to thousands of kilometers, if necessary, crossing seas, deserts or other inhospitable areas. They also have great orientation and navigational skills and are able to remember and re-find remote places they have previously visited. Birds can thereby occupy widely separated areas at different seasons, returning repeatedly to the same localities from year to year. Although migration is evident in other animal groups, including insects, mammals and fish, in none is it as widely and well-developed as in birds. The collective travel routes of birds span almost the entire planet. As a result of migration, birds’ distributions are continually changing on regular seasonal patterns and on local, regional or global scales.Benefits of becoming a teacherBecoming a teacher gives you a chance to spend a major portion of your day with children or youngsters. With kids around, you are a part of their world of innocence and purity. It indeed creates a healthy work environment for you. On becoming a teacher, you get a chance to be with children, laughing with them, think their way and enjoy their innocent, silly and hopefully naughty behavior. Apart from this, the nature of your job is that you do not work on weekends and you get your share of holidays. Becoming a teacher entitles you for receiving private scholarships and sponsorships for teaching programs. However, one of the most important benefits of becoming a teacher is that teachers contribute to the shaping of the future generations. They make a difference to society by playing a vital role in nurturing young minds.British and American police officersReal policemen both in Britain and the U.S. hardly recognize any common points between their lives and what they see on TV, if they ever get home in time. Somethings are almost the same, of course, but the policemen do not think much of them. The first difference is that a policema n’s real life deals with the law. Most what he learns is the law. He has to know actually what actions are against the law and what facts can be used to prove them in court. He has to know nearly as much law as a lawyer. And what’s more, he has to put it into practice on his feet, in the dark and running down a narrow street after someone he wants to talk to. Little of his time is spent in talking with beautiful girls or in bravely facing cruel criminals. He will spend most of his working life arranging millions of words on thousands of forms about hundreds of sad ordinary people who are guilty or not of stupid, unimportant crimes.CellphonesNowadays, Cellphon es play a dominant role in people’s life. On the one hand, the mobile phone is portable and convenient. You can reach a person wherever and however far away he is. On the other hand, it is a friend indeed. Whenever you come across trouble, you can call for help immediately. However, some people complain that mobile phones give unpleasant noise on some important occasions, when the owner forgets to turn them off. And it also cuts into peopl e’s spare time. Because with the mobile phone, the boss can easily reach them and call them to duty during their spare time.Privates carsWith the increase in the general standard of living, some ordinary Chinese families begin to afford a car. Yet opinions of the development of a private car vary from person to person. It gives a much greater degree of comfort and mobility1. The owner of a car is no longer forced to rely on public transport, and hence no irritation2 caused by waiting for buses or taxis. They maintain that as more and more cars are produced and run in the street, a large volume of poisonous gas will be given off, polluting the atmosphere and causing actual harm to the health of people. Whether private cars should be developed in China is a difficult question to answer, yet the desire for the comfort and independence a private car can bring will not be eliminated.。