no vocal sac polypedate无声囊泛树蛙
external superheater vocal sac外声囊
internal vocal sac内声囊
internal tariff vocal sac内声囊
external vocal sac外声囊
subgular vocal sac咽下声囊
N（名词） either of the loose folds of skin on each side of the mouth in many male frogs that can be inflated and act as resonators 声囊 [zoology]