英文關鍵字
artificial
asia
barn-door
barndoor
bionomics
bird
bodyn
breed
breeding
brown
cholera
cleans
contamination
dam
dammed
domestic
duck
ducks
farming
feed
feet
food
fowl
gallinarium
husbandry
industry
keeping
lake
macrophyte
macrophytes
meat
mountains
natural
organic
peking
phosphates
picturesque
plant
pollution
pond
poultry
production
reservoir
reservoirs
river
southeast
utrophication
water
weir
white