英文關鍵字
animal
beach
change
climate
coast
concept
contaminate
contamination
current
danger
dangerous
dead
deadly
death
decay
dirty
disaster
ecology
ecosystem
environment
environmental
fish
food
global
hygiene
lake
life
low
marine
mask
nature
ocean
outdoor
oxygen
poison
polluted
pollution
pond
problem
river
sand
sea
toxic
warm
warming
warning
water