英文關鍵字
animation
barrel
black
car
cargo
cistern
container
cylinder
delivering
design
diesel
energy
equipment
fossil
freight
fuel
gas
gasoline
heavy
icon
illustration
industrial
industry
isolated
liquid
motion
natural
object
oil
petrol
petroleum
power
rail
railroad
railway
shipping
sign
simple
steel
symbol
tank
tanker
track
traffic
train
transport
transportation
vehicle
wagon
web