英文關鍵字
activity
adult
bolt
building
business
chute
construction
drill
drilling
ductwork
durability
electric
engineer
equipment
fastening
hand
hardness
hat
hose
improvement
industry
installing
job
machinery
males
manual
men
metal
object
people
perforator
person
pipe
power
professional
reliability
repairing
screwdriver
stability
steel
strength
technology
tool
toughness
trough
tube
work
worker
working