通过对以光滑鱼为猎食的鱼鹰进行研究发现，它不象其它的食肉鸟类，它有四只同样长而非常有力的爪，并且最外边的一只是可以钩回和前后旋转。
Ospreys specialise in catching slippery fish. Unlike other birds-of-prey, they have four powerful toes of about equal length, while the outer one is reversible and can swivel backwards or forwards.
钩形槽的型面为主动凸轮或销钉(它使旋转与向下或向上移动相结合)提供轨道，于是提供了简单的但又可靠的启动工具的方法。
The J-slot profile creates the track for an actuating CAM or pin that combines rotation and up or down movement to provide a simple yet reliable means of tool activation.
调整双钩的顶钩以固定在股骨头中并提供旋转稳定性。
From the Twin hook, apical hooks are deployed to gain fixation within the femoral head and to provide rotational stability.
运用颈椎周围不同肌肉对颈椎作用力的变化，模拟正常活动范围内颈椎前屈、后伸、侧屈、旋转等多种工况。分别计算并得出相应载荷下钩椎关节、小关节应力值。
With the changing of muscular force, the movements such as flexion, extension, lateroversion and rotation were imitated, and the stress was calculated under different loads, respectively.
臂 的顶端部分是一体连接的并且各钩件可在周围旋转和沿所述顶端部分平移。
The top portions of the arms are integrally connected and the hook members can rotate around and translate along the top portion.
臂 的顶端部分是一体连接的并且各钩件可在周围旋转和沿所述顶端部分平移。
The top portions of the arms are integrally connected and the hook members can rotate around and translate along the top portion.
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