燃やす
advanced
alternative
alternative fuel
bale
bar
brick
briquette
brown
cake
coal
day
digging
fuel
fuels
group
hand
harvesting
heap
heat
heating
hold
industry
light
manufacturing
many
material
mining
mound
nonconventional
outdoors
peat
peat briquettes
pile
production
raw
raw material
rectangular
sample
shadow
shape
substances
sunset
sunshine
view
winter