typewriter with exchangeable type elements

例句：

1. 1.The typewriter was the first computer invented by a person.
   打字机是第一个由人发明的计算机。
2. 2. She typed her name on the typewriter.
   她在打字机上打上了她的名字。
3. 3. The typewriter is still used in many offices today.
   打字机在今天的许多办公室中仍然被使用。