英文關鍵字
area
birth
birthrate
child
childhood
children
creepy
declining
empty
fertility
from
fun
future
ghost
ground
growing
growth
horror
human
hunted
infertility
kid
kids
lack
metal
move
moving
natality
nature
new
nowadays
numbers
outdoors
outside
park
play
playground
playing
population
populations
rate
rates
reference
scary
set
spooky
sterility
swing
swinging
swings
technology
the
under
without