機器
access
accessibility
architecture
automatic
barrier
blue
boundary
building
check
china
city
construction
corridor
design
door
doorway
enter
entrance
entry
exit
gate
gateway
hall
inside
interior
metal
metro
modern
passage
passenger
portal
public
railway
row
security
sign
station
subway
system
technology
ticket
train
transport
transportation
travel
turnstile
underground
urban
way