英文關鍵字
bar
blade
clean
cleaning
cutting
design
electric
equipment
factory
grinder
grinding
hand
industrial
industry
iron
machine
machinery
male
man
manufacturing
material
metal
people
person
pipe
plant
power
red
rock
rust
rusted
rusty
safety
sandstone
steel
stone
store
technology
tool
tube
warehouse
work
worker
workshop