HSK 7-9
侃侃而谈
kǎnkǎn’értánto speak frankly with assurance
谈到古城历史专家侃侃而谈。
Tán dào gǔ chéng lì shǐ zhuān jiā kǎn kǎn ér tán.
The expert spoke confidently and at length about the ancient city's history.
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Appears across levels (7-9) in the HSK 3.0 word list.