The structure and working process of the extruding die for the boss of shell bodies were described in detail. And the defects occurred in formng the boss and the preventative measures were introduced.是什么意思_The structure and working process of the extruding die for the boss of shell bodies were described in detail. And the defects occurred in formng the boss and the preventative measures were introduced.在线翻译_英语_读音_用法_例句