英文關鍵字
and
city
day
end
environmental
falls
hazy
industrial
industry
new
niagara
part
pollution
river
skyline
smokestacks
the
visible
west
with
york
英文關鍵字
and
city
day
end
environmental
falls
hazy
industrial
industry
new
niagara
part
pollution
river
skyline
smokestacks
the
visible
west
with
york