英文關鍵字
electromagnet
magnet
magnetize
scrap
recycle
recycling
plant
factory
industry
equipment
production
workshop
produce
device
machine
apparatus
mechanism
ecology
eco
ecological
英文關鍵字
electromagnet
magnet
magnetize
scrap
recycle
recycling
plant
factory
industry
equipment
production
workshop
produce
device
machine
apparatus
mechanism
ecology
eco
ecological