英文關鍵字
accident
breakthrough
building
cable
canalization
city
clouds
construction
damp
drain
drainage
dump
dwelling
ecology
edifice
environment
flow
fountain
froth
house
humid
industry
jet
liquid
moscow
motion
nobody
noone
pipe
pollution
pour
problem
puddle
russia
sewer
sewerage
site
sky
spatter
stream
substance
system
urban
waste
water
wet
wire