英文關鍵字
adult
aged
casual
caucasian
close
closeup
communication
commuter
contemporary
device
electric
gadget
guy
hands
holding
human
journey
lifestyle
male
man
middle
mobile
modern
motion
music
one
passenger
people
phone
public
railroad
railway
ride
seat
sitting
slow
smart
smartphone
technology
telephone
texting
traffic
train
transport
transportation
travel
traveler
traveling
trip
using