英文關鍵字
absorption
active
advertising
air
ascend
atmosphere
background
beautiful
berlin
blue
brandenburg
capital
change
climate
cloud
clouds
condensation
cumulus
droplet
earth
ease
effect
europe
evaporation
force
germany
gravitation
heat
join
light
lightening
meteorology
movement
natural
nephology
over
oxygen
phase
physics
picturesque
planet
power
protection
reflection
saturation
scattering
shape
site
size
sky
space
spread
structure
summer
survival
thermal
transition
transport
very
vital
volume
water
weather
wind