科技方面的英语文章

PrefaceThe ARPANET – the Department of Defense network that is the ancestor of today’s Internet—was built in the late sixties using a proprietary protocol suite. This first protocol proved to have shortcomings for linking with other networks, which led to the development of Transfer Control Protocol/Internet Protocol (TCP/IP). TCP/IP used 32-bit address numbers. These soon proved to be unwieldy for most users, even when expressed in the less daunting formant of four 8-bit decimal numbers, delimited by periods. The obvious solution was a scheme for addressing computers by name. After all, people relate much better to names and find it much easier to remember the computer in the corner as “Frodo,” rather than “.”The First Generation: Hot TablesThe desire to refer to machines by name instead of number led to the first IP address management scheme: the host table. The host table is a file that contains all the IP address in use on a network, along with their names. The host table provides a mapping from a host’s name to its IP address, as well as reverse mapping: Given a host’s IP address, the user can look up its name. For a host table to be most user useful, it must contain the names of all the hosts with which a given host might want to communicate. For the ARPANET, that mean that the host table had to contain the names and IP address of every host on the network. Such a file was maintained by the Network Information Center (NIC), the central organization responsible for managing the ARPANET. The file was called and was similar in format to the/etc/hosts file on UNIX. Network administrators all over the network e-mailed host table changed to the NIC every time they added or deleted a host or changed a host’s IP address. The NIC made the changes to its master host table, which it made available via File Transfer Protocol (FTP). Administrators periodically downloaded the latest version of the host table to stay current.

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关于科技的英语作文：Science and technology have changed our life thoroughly throughout the history, especially in the last century. There is a prevailing understanding about science and technology among the general public that they are the same thing of two different names but they are acutally two things. Science is kind of series of theorrtical concepts and people can accept it or not, and it will not affect commom people's life to a large extent, but it's a different way when it comes to technology because technology has more pratical effect on people. People have to endure the results of the pactical applicance of technology whether they are good or not, such as the air pollution, and it all happens without people's acceptance, for it all depends on the local governments' or even the nations' decision.关于科技的英语作文：The development of science and technology makes our life more comfortable and convenient. However, scientists have created many problems, which are not easy to be resolved, such as air pollution, the deterioration of environment and the scarcity of natural resources, to which we must some science and technology render people many advantages. Modern telecommunication shortens the distance between people and makes communication much easier. Internet is widely used now not only for collection of abundant information but also for correspondence. Email, the most effective communication device now, is becoming very popular. Besides, telephone and mobile phone make contact more convenient than transportation, such as airplanes and high-speed trains make our journey smooth and fast. With the help of modern transportation, people can go everywhere they prefer to. The journey to outer space and other planets is not a dream any more. Rockets and space shuttles can help us realize the dream of space medicine prolongs peoples life and relieves patients of sufferings from many diseases. Cancer and AIDS are fatal to peoples health. Thanks to the endeavors scientists have made, these diseases become , the process of scientific development also arouses many sever problems to our human beings. Internet, though widely used in modern communication, is easy to be destroyed by computer virus. Outer space exploration has produced much waste in the space. A tiny metal, a screw, for example can destroy a flying man-made satellite. Industrialization is making natural resources become with these problems, scientists are seeking prompt and feasible solutions. The development of science and technology bring about both positive and negative effects to us. We must eliminate the positive effects to the least extent.