关于信息检索的英语演讲

关于信息检索的英语演讲
A general-purpose machine that processes data according to a set of instructions that are stored temporarily or permanently within the computer. A computer and all its accessories are called hardware. Instructions that tell it what to do are called "software.".
set of instructions to perform a specific task is called a "program" or "software program". The instructions in a computer's program direct the computer's input, processing, and output as follows: after the input / output computer processes data internally, it can selectively retrieve data from any peripheral device connected to it (terminal, disk, tape, etc.) into its main memory (RAM) for calculation The more memory there is, the more programs and data it can process at the same time. By outputting the data to disk or tape, the computer can store data permanently and retrieve data when needed.
The size of the system depends on how much disk storage space it has. The more disks there are, the more data is immediately available. A computer performs all processing by "calculating," "comparing," and "copying" data stored in memory.
A computer can perform any mathematical operation on the data by adding and subtracting, multiplying one set of data with another and dividing it by another set of comparison computers can analyze and evaluate data by comparing the data with or contained in the program From the known datasets
called in StorageCopy, matching computers can move data, create any type of reports or lists in any order, calculate, compare and copy through computation, comparison and replication. The computer performs various forms of data processing, for example, by recording two records at a time and copying the lower value records to records with higher values. Sort in a new order the computer finds a customer query statement in thousands of customers by comparing the requested account number with each record in the file: sum salary for title = nurse causes the computer to compare the title fields in each record of nurses, and then adds (calculates) salary fields for each match.
In word processing, inserting and deleting text is accomplished by copying characters from one location to another.。