英文關鍵字
african
american
bit
caucasian
close
construction
cutter
drill
drilling
engineer
engineering
equipment
factory
hole
indoors
industrial
industry
instrument
iron
lockdown
machine
machinery
male
manual
manufacturing
men
metal
motion
occupation
operating
overalls
people
power
precision
senior
sixties
skilled
slow
steel
tool
twenties
two
work
worker
working
workman
workshop
young