An air-filled sac or structure that aids in the flotation of an aquatic organism.
An air-filled sac or structure that aids in the flotation of an aquatic organism.
气囊水生动植物器官中用来帮助飘浮用的充满气体的囊或结构
An air-filled sac or structure that aids in the flotation of an aquatic organism.
气囊水生动植物器官中用来帮助飘浮用的充满气体的囊或结构