英文關鍵字
boat
cloudy
cold
danube
day
floe
floes
freeze
freezing
frost
frozen
harbor
ice
icebreaker
icy
meteo
nature
navigation
river
ship
snow
transportation
tug
tugboat
vessel
water
waterways
wheather
winter
英文關鍵字
boat
cloudy
cold
danube
day
floe
floes
freeze
freezing
frost
frozen
harbor
ice
icebreaker
icy
meteo
nature
navigation
river
ship
snow
transportation
tug
tugboat
vessel
water
waterways
wheather
winter