英文關鍵字
2020
academic
achievement
adult
businessman
call
college
communication
computer
congratulating
coronavirus
cyberspace
desk
device
discussion
distant
education
elearning
exam
graduation
greeting
homework
indoor
laptop
meeting
online
parent
person
professional
protection
quarantine
school
sitting
student
study
success
talking
technology
teenager
university
usa
video
waving
woman
working