英文關鍵字
30s
adult
caucasian
class
classroom
college
computer
desk
education
elear
electronic
internet
learn
learning
male
man
mature
mid
monitor
pc
people
room
screen
sitting
student
study
studying
technology
two
university
using
英文關鍵字
30s
adult
caucasian
class
classroom
college
computer
desk
education
elear
electronic
internet
learn
learning
male
man
mature
mid
monitor
pc
people
room
screen
sitting
student
study
studying
technology
two
university
using