機器
environmental
action
calendar
chain
chainsaw
chip
cortex
cross section
damage
danger
dead
destruction
ecological
ecological problem
ecology
energy
forester
forestry
green
hardwood
horizontal
industry
job
lumber
material
natural
nature concept
old tree
pile
pine
power
protection
protective
raw material
ring
rough
saw
sustainability
texture
timber
tool
tree
trees
trunk
wood
woodland
work
worker