英文關鍵字
man
tool
grinder
engineering
machine
safety
skill
circular
electric
person
work
industry
cutting
equipment
grinding
factory
flash
technical
disc
workshop
angle
danger
manual
blade
construction
cut
metal
dust
material
disk
renovation
fence
iron
technology
grated
protection
electricity
construct
glove
kneepad
heavy
rust
goggles
gate