英文關鍵字
background
building
buzz
buzzing
carrier
carriers
city
dirty
disease
diseases
dump
factory
fleas
flies
fly
flying
food
garden
gnats
hot
hygiene
hygienic
illness
industrial
insect
insects
lots
many
mosquito
mosquitoes
outdoors
outside
plant
river
rubbish
sewer
shop
skip
small
store
street
sunny
tiny
tip
town
trash
warm
yard