英文關鍵字
angle
billets
chalybeate
channel
cleans
construction
details
disk
engineering
fabrication
ferriferous
ferrous
ferruginous
fittings
glandiform
glandular
gloves
grinder
grinding
gyre
hand
harvesting
hazardous
industry
iron
labor
machine
make
manufacture
manufacturing
mask
metal
metallic
metalline
metallurgical
metallurgy
pitting
production
protection
reinforcement
rust
rusty
salvaging
spark
steel
steely
technology
utilization
welder
welding