英文關鍵字
agriculture
agronomy
archaeology
archeology
autumn
autumnal
background
bare
trees
beige
blue
brown
cold
conduction
control
density
education
erosion
forest
ground
hatch
hatching
heat
hill
ice
icing
leaf
melting
oak
plowing
quercus
robur
scientist
season
sky
snow
soil
streaks
striped
stripes
structure
sunny
temperature
topsoil
trunk
winted
winter