英文關鍵字
teacher
school
professor
class
presentation
lecture
training
university
character
flat
knowledge
person
animation
video
clip
motion
popup
man
male
costume
remotely
call
online
education
chemistry
microscope
smart
cartoon
standing
cheerful
graphic
idea
explain
skill
student
happy
job
lesson
modern
profession
showing
speaker
talk
teaching
work
young
bright
colorful