英文關鍵字
algae
aquarium
audio
cylibdrical
defense
discharges
eel
electric
electrical
electricitygenerating
electricus
electrophorus
fish
freshwater
knifefish
long
plants
shock
shocks
swimming
system
tank
voltage
volts
water
英文關鍵字
algae
aquarium
audio
cylibdrical
defense
discharges
eel
electric
electrical
electricitygenerating
electricus
electrophorus
fish
freshwater
knifefish
long
plants
shock
shocks
swimming
system
tank
voltage
volts
water