So repeated several times, until the blade sharp, come together, knife surface bright as a mirror.

如是重复几次，直至刀口锋利、崭齐，刀面光亮如镜。

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A sharp blade is likely to nick the skin and draw blood.

锋利的刀刃可能会划破皮肤，引起出血。

《柯林斯英汉双解大词典》

The youth like the early spring, like the morning sun, like the budding flowers, like the sharp blade fresh off the grinding stone.

青春如初春，如朝日，如百卉之萌动，如利刃之新发于硎，

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The blade is sharp on the inside of the curve, allowing the user to swing it through crops, cutting and gathering them at the same time.

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He still occasionally blacksmiths in a little tin shed on the Patagonia campus, and he showed me his latest project, a metal mussel knife that he's been beating into perfect shape sharp at the blade to pry open the shells, blunt at the handle to knock away the barnacles.

WSJ: Patagonia's Founder is America's Most Unlikely Business Guru

These early tools closely resembled the knives we use today, consisting of a piece of metal that was sharp on one end--the blade--and dull on the other--the tang.

FORBES: No. 1 The Knife