英文關鍵字
africa
african
bacteria
black
boy
boys
change
child
childhood
children
cholera
clean
cleaning
climate
countries
developing
development
female
females
fresh
freshwater
girl
girls
global
globe
human
hygiene
ill
illness
issue
issues
poor
poverty
problem
rights
soap
soapy
social
society
south
sudan
symbol
unhygienic
warming
wash
washing
water
young