英文關鍵字
adult
analysis
background
belief
book
brochure
browsing
close
closeup
desk
document
education
educational
feet
file
fingers
flipping
foreground
guidebook
hand
hands
holding
indoor
information
knowledge
learn
leisure
library
lifestyle
literary
literature
many
material
page
paper
person
read
reading
research
sitting
socks
student
study
studying
table
turning
university
wisdom