英文關鍵字
electronic
payment
smart
ticket
pay
transport
hand
passenger
entrance
suburban
train
subway
validation
technology
terminal
customer
paying
digital
mobile
contactless
travel
wireless
device
person
vehicle
man
urban
card
machine
connected
internet
public
service
system
transaction
cashier
reader
bus
commuter
modern
money
buy
city
male
traffic
young
station
display
online