侃侃而谈 speak confidently and calmly
Explanation
侃侃而谈指的是理直气壮，从容不迫地说话。形容说话理直气壮，从容不迫。
Kǎn kǎn ér tán means to speak confidently and calmly. It describes someone who speaks with conviction and composure.
Origin Story
春秋时期，齐国有一位名叫晏婴的著名政治家，他以才智过人，善于辞令而闻名于世。一次，齐景公问晏婴：“你认为我治理国家怎么样？”晏婴不卑不亢，侃侃而谈，对齐景公的治国方略进行了全面的分析，既肯定了他的优点，也指出了他的不足之处，最后还提出了许多建设性的意见。晏婴的坦诚直言，赢得了齐景公的赞赏，也使齐国的国政得到了有效的改进。
During the Spring and Autumn period, there was a famous statesman named Yan Ying in the State of Qi. He was known for his extraordinary intelligence and skill in rhetoric. Once, Qi Jinggong asked Yan Ying, "How do you think I am governing the country?" Yan Ying answered without being arrogant, speaking confidently and calmly. He provided a comprehensive analysis of Qi Jinggong's state governance strategy, affirming his strengths and pointing out his shortcomings. Finally, he also put forward many constructive suggestions. Yan Ying's honesty and straightforwardness won Qi Jinggong's appreciation, and also led to effective improvements in the state governance of Qi.
Usage
形容说话理直气壮，从容不迫。
It describes someone who speaks confidently and calmly.
Examples
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他侃侃而谈，赢得了听众的阵阵掌声。
ta kan kan er tan, yingdelele tingzhong de zhenzhen zhangsheng.
He spoke eloquently, winning the audience's applause.
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会议上，他侃侃而谈，阐述了自己的观点。
huiyi shang, ta kan kan er tan, chanshu le ziji de guangdian.
At the meeting, he spoke confidently and clearly about his views.