Archaeopteryx shows no obvious features of gliders, such as a broad membraneconnecting forelimbs and hind limbs.
始祖鸟并没有表现出明显的滑翔机的特征，比如有一层连接前肢和后肢的宽膜。
2
The metathoracic accessory pulsatory organ is very small and has no direct channels connecting the dorsal vessel, but there is a pulsating membrane without muscle.
后胸辅搏动器很小，与背血管无直接通道，具有一个没有肌肉的搏动膜。
3
The primary goal of this research is the non-linear properties of the loose joint of membrane pump's connecting rod and slider.