機器
adjusting
altering
architecture
building
control
detail view
engine
engineering
equipment
european
flood
flood control
gear wheel
historical
history
industrial
industry
iron
jam wall
machinery
mechanical
metal
object
old
part
power
production
protection
retro
rustily
rusty
seal
sealing off
steel
system
technology
traditional
transmission
transportation
valve
water
waterworks
wheel
work