英文關鍵字
adult
age
background
board
boy
boys
business
businessman
businesspeople
cartoon
class
classroom
college
conference
corporate
education
educator
finance
girls
group
happy
illustration
indoors
leader
learning
lecture
lesson
male
management
manager
meeting
microphone
people
portrait
presentation
school
sitting
students
success
teacher
team
technology
teenagers
trainer
training
university
white
young