英文關鍵字
30s
40s
adult
african
american
audience
black
business
businessman
businesswoman
casual
caucasian
conference
confidence
convention
corporate
delegates
diverse
ethnic
female
forties
group
happy
indoors
large
listening
male
meeting
men
multi
people
person
presentation
seminar
sitting
smiling
speaker
team
teamwork
thirties
togetherness
training
women
writing
young