機器
appointment
architecture
arrival
brick
bridge
building
business
cable
cloud
concrete
construction
departure
drive
electric
electricity
engine
food
fuel
industry
infrastructure
iron
journey
line
mechanic
metal
modern
motor
operate
package
passenger
peddler
people
perspective
platform
pole
post
public
rail
railway
sky
sky train
station
sunlight
technology
track
train
transportation
travel