Because the ideal “rigid joint” and “hinged joint” are inexistent, the stiffness of any connection types is between ideal rigid joint and hinged joint.

因为理想的刚节接是不存在的，任何连接形式的刚度都是介于理想刚接完全接之间的。

The team also noted a hinged flap near the base of the wing, called an Alula, which is deployed at right angles to the wing, which may be being used as a air flow-control device.

这个小组还注意到，翼附近接的副翼，被称为小翼的，对翼成直角配置，它可能被用来作为空气流量控制装置。