英文關鍵字
africa
alone
background
beautiful
black
closeup
conservation
dark
defective
desert
drink
drip
drought
environment
equipment
famine
faucet
flowing
handle
hot
household
india
industry
isolated
lack
leaking
light
liquid
metal
nature
old
open
out
pipe
plumbing
pouring
pure
run
save
scarcity
shortage
silhouette
slow
steel
sunlight
tap
tube
valve
wastage
waste
water
waterdrop