英文關鍵字
climate
cobbles
concept
conceptual
desertification
earth
eco
ecological
ecology
economy
ecosystem
environment
environmentally
friendly
global
green
impound
lake
lakebed
limpid
marine
message
nature
pebbles
pollution
precious
renewable
reservoir
resource
risk
river
riverbed
sea
seabed
shore
stones
survival
technology
thermal
transparent
warning
water
waves
word