话说唐朝时期，长安城里有一位著名的工匠名叫李师傅，他技艺精湛，承接了不少皇宫的修缮工程。一次，李师傅接到了一个修缮宫殿屋顶的任务。他精心挑选材料，一丝不苟地进行施工，眼看就要完工了，却发现一个工匠总是偷偷摸摸地破坏他的工作成果。此人名叫张三，因为嫉妒李师傅的技艺，便处处从中作梗。他有时会在夜里偷偷地把李师傅新钉好的木板撬开，有时会在李师傅精心制作的屋脊上涂抹劣质胶水，试图让屋顶漏水。李师傅发现后十分生气，但他没有声张，而是暗中观察，终于抓住了张三的证据。他将此事禀报了工部尚书，工部尚书大怒，将张三革职查办，李师傅则顺利完成了宫殿屋顶的修缮工作，他的精湛技艺得到了皇帝的赞赏。
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