锋利的刀刃可能会划破皮肤，引起出血。

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

《柯林斯英汉双解大词典》

梳头：用木梳从前额至头顶部向后部梳刷，梳时不要用力过猛以防划破皮肤。

Comb hair: comb backwards from the forehead to the back of head via the top, comb without too much force against the skin.

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三千年来，人们划破皮肤放血或使用水蛭吸血，因为他们认为放血可以改善人们的身体。

For 3,000 years, people have been cut or given leeches to let out the blood because they thought that would make people better.

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