英语翻译 做题

American physicist John Atanasoff 1 the first computer in the late 1930s and 2 1940s. And from 3 on computers have been improved 4 and they 5 in almost every field. It is thought to be one of the most important 6 in the modern world. China had its first computer in 1959. It was used to design bridges and buildings. And since then it 7 in more fields,such as in the post office,where it can be used to sort(分检) the letters very 8 .In the CAAC,it helps to 9 tickets and makes our travel more 10 . In hospitals, it can 11 to find out patients’(患者的) illness quickly without making mistakes. Most of us know about Persnal Computer(PC), 12 is desighed to be used 13 a single person. A PC is smaller, less expensive,and easier to 14 than other kinds of computers. It 15 in schools offices, factories, families and so on .