英文關鍵字
airport
arrival
elevator
empty
escalator
metro
modern
motion
move
movement
moving
nobody
passenger
perspective
stair
stairway
subway
transport
travelator
traveler
travolator
underground
upward
urban
walkway
way
英文關鍵字
airport
arrival
elevator
empty
escalator
metro
modern
motion
move
movement
moving
nobody
passenger
perspective
stair
stairway
subway
transport
travelator
traveler
travolator
underground
upward
urban
walkway
way