dull blade meaning in English

钝的

And scraping a dull blade of a rusty knife around your scalp
然后用一把生锈的钝刀
. . . and scraping a dull blade of a rusty knife around your scalp . .
然后用一把生锈的钝刀
The whetting part is made of super durable special ceramic materials , that help to shape the dull blade quickly and improve the knife ' s quality
磨刀器部分采用超耐磨的特殊陶瓷材料，从而将较钝的刀锋快速修正成型以及提高刀刃的质量。
The whetting part is made of high rigidity metal , will remove the knife ' s surface metal by steel scurf , easy to control when whetting , and then fast shape the dull blade
磨刀部分采用高硬度的硬质合金材料，将刀具表面的金属以钢屑的方式去除，磨刀时用力易于掌控，从而将较钝的刀锋快速修正成型。