英文關鍵字
circle
circular
cylinder
disc
disk
electric
engineering
factory
fire
flame
flash
handyman
horizontal
indoors
industrial
instrument
iron
job
machine
manual
manufacturing
masterpiece
material
mechanic
men
people
power
production
protection
radial
repair
round
safety
saw
science
skill
spark
speed
steel
structure
technical
tool
treatment
turning
video
wheel
worker
workshop