Translation of "knife blade" into Chinese

The flat sharp edges are like knife blades.

平滑的锋刃和刀刃一样。

“They kept screaming while two of them took my arms and one jabbed my back with what felt like a knife blade.

当其中两人抓住我胳膊、一个人似乎用刀片捅我后背时,她们不停地尖叫。