To speak unhurriedly and with the confidence that you are correct
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Positive
小明在讲演比赛时，不拿稿子也能侃侃而谈 | Xiǎomíng zài jiǎngyǎn bǐsài shí, bù ná gǎozi yě néng kǎnkǎnértán
During speech competitions, Little Ming can speak calmly and assuredly even without using notes
[Source]
非常感谢你给我这个机会让我在这可以侃侃而谈，分享我这微不足道的经验 | Fēicháng gǎnxiè nǐ gěi wǒ zhè ge jīhuì ràng wǒ zài zhè kěyǐ kǎnkǎnértán, fēnxiǎng wǒ zhè wēibùzúdào de jīngyàn
I'm very grateful that you've given me the opportunity to speak here and share my insignificant experiences
[Source]
None
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This is an HSK chengyu
《论语》(Lún Yǔ), or the Analects of Confucius
This chengyu comes from a line in the work listed in the "Origin" section above