英文關鍵字
abstract
agricultural
agriculture
background
bolt
bread
building
cap
chain
color
combine
construction
cutting
diagonal
elements
enamel
equipment
exhibition
grim
group
harvester
harvesting
heavy
industrial
industry
iron
large
machine
machinery
manufacturing
metal
nut
object
occupation
outdoors
part
pin
plant
red
ripe
row
rural
rust
steel
straw
technology
thread
transportation
vehicle
wheat
wheel