Tā bóshíduōtōng, tánqǐ rènhé huàtí dōu tóutóu-shìdào.
He is erudite and perceptive - on any topic, he speaks with clarity and order.
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From 《太平广记·伎巧》, where 张善 was praised as 博识多通 for identifying a golden duck as having come from Qin Shi Huang's tomb based on its date. The idiom celebrates not just wide reading but the ability to apply that knowledge to concrete problems.
