英文關鍵字
adult
book
casual
caucasian
closeup
college
comfort
cute
document
education
educational
encyclopedia
exam
female
finger
girl
hand
holding
home
indoor
information
intelligent
knowledge
learn
learning
lesson
library
lifestyle
literature
looking
open
page
people
person
read
reader
research
searching
shelf
sitting
smart
student
study
studying
through
university
woman
young