（翻译）1.Four common storage devices are a floppy disk drive, a hard disk drive, a CD-ROM drive, and a DVD-ROM drive.
2.Four commonly used input devices are the keyboard, the mouse, a microphone, and a PC camera.
3.An optical scanner reads printed text and graphics and then translates the results into a form computer can use.
4.Resolution typically is measured in dots per inch (dpi), and is stated as the number of columns and rows of dots..
5. Display devices include CRT monitors, flat-panel displays.
