英文關鍵字
action
afternnon
ball
cement
chile
concrete
copper
cylinder
cylindrical
device
duty
electric
engineering
equipment
factory
freight
grinder
grinding
heavy
huge
industrial
industry
industrya
inside
machine
machinery
manufacturing
materials
mechanical
metal
mill
mine
mineral
mixer
mixing
moving
nobody
occupation
outdoor
place
plant
process
processing
roll
roof
rough
sphere
strong
sunset
transportation
type
used
work
working