英文關鍵字
aerial
apocalyptic
aquatic
beautiful
catastrophe
clay
danger
dangerous
degradation
ecological
ecology
ecosystem
environmental
geographic
geography
global
industrial
lake
log
minerals
mud
natural
nature
one
picturesque
pink
poisoned
pollution
problem
problems
protection
radioactive
reservoir
technical
touristic
toxic
tranquility
travel
waste
wonderful
zone