木材ペレット
alternative energy
backgrounds
beech
biofuel
biomass
biomasse
briqettes
brown
bundle
closeup
cylinder
energy
environment
foreground
fuel and power
group of objects
heap
horizontal
in a row
large group of objects
lump
material
nature
oak
organic
pellet
pellet gun
pellets
pine
selective focus
wood
wood chip
wood pellets