影片讲述在清末的上海，一个顽皮的弄堂少年阿榔阴差阳错进入江南制造局成为学徒，从而开始了他的精彩人生冒险。在师父陈铁寒的谆谆教导下，阿榔潜心学习机造技艺，逐渐成长为顶尖机匠，面对敌方间谍的不断纠缠，在自强不息与百折不挠中制造出了重要的国产军械。
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