英文關鍵字
adult
aged
boyfriend
caucasian
communication
commuter
conversation
couple
discuss
family
friend
girl
girlfriend
guy
handsome
happy
journey
joyful
love
man
metro
middle
pair
passenger
people
positive
public
railway
relationship
sitting
smile
smiling
speak
speaking
subway
talk
talking
together
togetherness
train
transport
transportation
travel
traveler
trip
tube
two
underground
vehicle
white
woman