goat hair for making pen是什么意思

用法例句

Research on Ball Pen Mould Conceptual Design Technique Based on CBR;

基于CBR的制笔模具方案设计技术研究

The small power unit system of the ball-pen machine with multi-station should operate smoothly at high speed for the quality and efficiency of the tip of ball pen.

多工位制笔机床的小动力头系统要求高速、稳定地旋转,以保证笔头的加工质量和生产效率。