刀刃

qián yào huā zài dāo rèn shàng

钱要花在刀刃上。

Money should be spent on where a thing can be put to best use

fēng lì de dāo rèn kě néng huì huà shāng pí fū

锋利的刀刃可能会划伤皮肤。

A sharp blade is likely to nick the skin.

duàn zào dāo rèn xū yào gāo chāo de jì shù

锻造刀刃需要高超的技术。

To forge a blade takes great skill.