英文關鍵字
agriculture
bush
central
challenge
chasm
coniferous
conservation
cultivation
cut
deforestation
down
ecological
environmental
evergreen
farming
food
forest
forestn
forestry
forests
growth
hill
issue
land
lanka
manipulation
mountain
mountains
mountainside
nature
new
old
plantation
plateau
problem
produce
rain
rainforest
rainforests
secondary
sector
shrub
shrubbery
shrubs
site
spring
sri
timber
tree
tropical
undergrowth
vegetation
wood
woodland
young