英文關鍵字
gear
mechanism
rotation
turn
industrial
detail
technical
rust
old
dirty
metallic
corrosion
steel
transmission
engine
engineering
grunge
machine
machinery
mechanical
metal
part
round
wheel
attach
circle
iron
technology
rusted
motion
equipment
abandoned
texture
weathered
work
mechanic
corroded
grease
obsolete
rusty
details
closeup