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成语】： 班门弄斧 【近义词】： 布鼓雷门、贻笑大方 【反义词】： 虚怀若谷、自知之明、知人之明 【拼音】： bān mén nòng fǔ 【解释】： 在鲁班门前舞弄斧子。比喻在行家面前卖弄本领，不自量力。 【出处】： 唐·柳宗元《王氏伯仲唱和诗序》：“操斧于班、郢之门，斯强颜耳。”宋·欧阳修《与梅圣俞书》：“昨在真定，有诗七八首，今录去，班门弄斧，可笑可笑。” 【举例造句】： 闻得亭亭姐姐学问渊博，妹子何敢班门弄斧，同他乱谈。 ★清·李汝珍《镜花缘》第五十二回 【用法】： 作谓语、定语、状语、宾语；指能力不如人

If you are not an expert, don't show off your skills as it says "never offer to teach fish to swim."

When we are accompanied by someone who is better than us in certain aspects, remember to keep a low profile and never offer to teach fish to swim.

I heard Stephen made a big joke in Prof. Wang's lecture that he tried to educate the professor how to perform the experiment and failed pathetically; so never offer to teach fish to swim.

Never offer to teach fish to swim, unless you are a shark.