英文關鍵字
entrance
gate
machine
modern
passenger
people
person
station
transportation
access
paying
payment
public
technology
ticket
transport
travel
communication
metro
pay
subway
exit
train
interior
railway
card
city
turnstile
underground
urban
device
lifestyles
barrier
commuter
inside
security
system
tourist
transit
turnstiles
journey
design
automatic
coronavirus
control
pass
rapid