猎人们必须靠近浮冰的边缘，才能用尖利的爪钩捕捉鲸鱼。
Hunters have to get near enough to the edge of the ice to retrieve the narwhal with a grappling hook.
同时同一对爪钩可抓放不同宽度的晶体管框架，其适应性更强。
Simultaneously the identical claw hook can snatch up and lower down the transistor frames of various widths, and the compatibility is stronger.
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.
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