The hard bone has dulled up the knife blade.

这硬骨头把刀刃弄钝了。

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Unlike that benignly daft creature, this real-life surgeonfish in Indonesia carries a sharp retractable blade of bone near the base of its tail.

跟那只疯疯癫癫的亲切生物不同，印度尼西亚的这只正牌医生鱼在尾巴附近有一片能伸缩的锋利骨片。

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These include structures like a wide blade at the top of the hip bone that allows for more muscle attachments to help in balancing.

这些包括在髋骨顶部的宽骨片结构，允许更多的肌肉附着于其上，帮助平衡。

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Other finds include the bone comb once used by an image conscious lough dweller and a metal blade which is still sharp after hundreds of years.

BBC: nit comb

Pistorius, whose legs were amputated below the knee when he was 11 months old due to a bone defect, runs on special carbon fiber blades from which his nickname "The Blade Runner" derives.

CNN: STORY HIGHLIGHTS