A method oriented punch process is presented which blends experimental knowledge and professional skills into the procedure of feature modeling.

面向钣金件的冲切加工，提出了将钣金零件制造的经验知识与专业技术融入特征造型过程的方法。

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Thirty years ago low-paid, blue-collar workers were more likely to punch in a long day than their professional counterparts.

30年前，低收入的蓝领工人们长时间工作的可能比其他领域的人要大。

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