英文關鍵字
angle
angular
background
basement
black
bulgarian
circle
circular
construction
cutting
disc
electric
engineering
equipment
factory
fastflying
flash
grinder
grinders
grinding
hand
horizontal
industrial
industry
iron
job
light
machine
machinery
man
manual
manufacture
manufacturing
mechanic
metal
occupation
pipe
power
production
protection
safety
spark
sparks
steel
technical
tool
wheel
work
worker
workshop