adult
asian
background
books
bookshelf
chinese
class
college
communication
computer
concept
course
digital
distance
education
elearning
eteaching
headphones
headset
indoors
internet
japanese
knowledge
korean
laptop
learning
lecture
library
lifestyle
male
man
middle aged
modern
online
people
professor
selective focus
student
study
taking notes
teacher
teaching
technology
training
tutor
university
video call
vietnamese
website