英文關鍵字
angle
away
background
black
bright
builder
caucasian
circular
close
construction
cut
cutting
danger
disassembling
disk
electric
engineering
equipment
factory
fire
flash
flying
gloves
grind
grinder
hand
hot
industrial
industry
iron
light
lot
machine
man
manual
metal
old
original
pipe
power
production
protection
safety
saw
side
sound
spark
sparks
steel
supply
technical
technology
tool
water
wheel
work
worker
workshop