英文關鍵字
agriculture
american
army
backdrop
background
brown
business
combine
construction
container
corn
crop
dirty
dry
dryer
element
equipment
factory
farming
feed
fighter
flour
flow
foam
food
grain
granary
harvesting
industrial
industry
interior
isolate
jet
liquid
machine
machinery
meal
metal
military
mill
mills
plane
plant
power
processing
production
seed
silo
silos
storage
structure
technology
usa
wall
warehouse
water
wheat
white
work