英文關鍵字
a
africa
african
bacteria
beautiful
boy
boys
child
children
cholera
cleaning
countries
crisis
culture
developing
development
education
face
female
females
fresh
freshwater
girl
girls
human
issue
issues
justice
modern
one
poor
poverty
rights
soap
soapy
social
society
south
sudan
symbol
two
village
water
woman
women
young