甲鱼拉动诱饵使钩尖瞬间内收，抓住甲鱼。

The turtle pulls the bait, and the hook point is instantly collected inward, thus the turtle is catched.

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四钩柄扁平，必需保证在弹簧伸缩时始终保证钩尖朝上。

The four hook handles are flat, and the four hook handles are required to maintain the hook points to be upward when the spring stretches.

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爱斯基摩人用尖鱼刺作箭的倒钩。

The Eskimo barbed the arrows with pointed fish bones.

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