英文關鍵字
area
baby
birth
birthrate
child
childhood
children
close
creepy
declining
disaster
empty
fertility
future
ghost
growing
growth
horror
human
hunted
infertility
kids
lack
metal
move
moving
natality
nature
nowadays
numbers
outdoors
outside
park
parkautumn
play
playground
playing
population
populations
rate
rates
reference
scary
spooky
sterility
swing
swinging
swings
technology
time
without