英文關鍵字
line
icon
animation
plant
factory
combustion
industry
production
processing
manufacture
burning
power
producing
pollution
contamination
atmosphere
air
environmental
emission
issue
gas
chimney
linear
motion
graphic
pictogram
hd
video
thin
logo
outline
loop
art
contour
drawing
animated
illustration
concept
web
symbol
flat
lineart
isolated
design
sign
item
dynamic
simple
dark