The hard bone has dulled up the knife blade.

这硬骨头把刀刃弄钝了。

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The knife blade Angle is small, when cutting labor.

现有菜刀的刀刃角度较小，切菜时省力。

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But the shark jerked backwards as he rolled and the knife blade snapped.

但是鲨鱼朝后猛地一扭，打了个滚，刀刃啪地一声断了。

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Doctors in Canada have removed a knife blade from a man's back more than three years after he was stabbed in a fight.

BBC: Knife taken from Billy McNeely's back after three years

The swish of the knife blade.

NPR: Excerpt: 'Killer Weekend'

Audetat also found a foldable knife with a 4-inch blade in Loughner's front pocket.

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