To show off one's slight skill before an expert; to teach one's grandmother to suck eggs, implying one's presumption or lack of self-awareness.
在这么多经验丰富的建筑师面前谈论结构设计，我感觉自己简直是运斧般门，有点不好意思。
Discussing structural design in front of so many experienced architects, I feel like I'm showing off my slight skill before experts, a bit embarrassed.
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