英文關鍵字
children
social
problem
line
symbol
public
problems
worldwide
ageing
human
democracy
decolonization
atomic
energy
development
religious
wars
poverty
lack
economic
opportunity
government
accountability
transparency
corruption
food
water
security
education
safety
aids
ocean
law
sea
scale
data
sustainable
conflicts
africa
climate
change
destruction
nature
icon
motion
graphic
animation
pictogram
hd
animated
item
sign
color