英文關鍵字
animal
animals
asia
berlin
big
captive
captivity
conservation
cruelty
danger
depressed
depression
domesticated
eating
elephant
elephants
endangered
farm
fence
five
freedom
germany
grazing
male
mammal
natural
nature
observation
outdoors
park
prison
prisoner
sad
sadness
safari
slavery
surviving
tourism
trapped
travel
trunk
tusk
uneasy
unhappy
watching
wild
wilderness
wildlife
zoo
zoology