英文關鍵字
bubble
circulation
clean
clear
concept
domestic
drink
drinking
droplets
drought
ecology
economy
falling
filling
flowing
fluid
fresh
glass
kitchen
liquid
loss
outflow
overflow
overflowing
overflows
people
pouring
problem
pure
purity
resource
resources
responsibility
responsible
sink
splash
supply
tap
thirst
transparent
unnecesary
use
waste
water
watersupply
wet