英文關鍵字
sparks
fly
all
directions
when
processing
metal
parts
factory
angle
grinder
blade
circle
circular
close-up
construction
cutoff
cutting
disc
disk
electric
engineering
equipment
fire
fix
flame
flash
grind
hand
hot
industrial
industry
instrument
labor
light
locksmith
machine
machinery
manual
manufacture
manufacturing
mechanic
power
production
protection
rotate
round
safety
spark
speed
steel
technical
technology
tool
welder
wheel
work
worker