n.硬节，滚花...

knurl的音标：knurl的英式发音音标为：[nɜ:l]knurl的美式发音音标为：[nɜl]...

There are lots of advantages by cold extrusion for straight knurl nut in a single process.直纹滚花螺母采用冷挤压一次成形新工艺,成效显著....