backup
ball pen
blue
book
cd
chinese
close up
closeup
compact
content
copy
copyright
culture
data
dictionary
digital
disc
dvd
e book
education
high density
information
ink
isolated
knowledge
layer
learning
library
modern
online
open
optical
page
paper
pen
rainbow
recordable
red
reflecting
reflection
reliable
schooling
storage
stored
system
text
textbook
white background
writing