Mr. Wu, a foreman at the Dalian factory, has over 40 years 'experience in forge work. But at that time he knew little about pattern-welded steel, and did not know how the required pattern could be produced.
大連工廠一位吳班長，有四十幾年的鍛造技術，對使用鍛造鎚很熟練，但缺乏花紋鋼的知識，不懂如何才能打出需要的紋路。