抵掌而谈

Explanation: On that very harmonious. 　　Usage: Partial official; as predicate; described a cordial atmosphere 　　Source: Han Liu Xiang, "Qin Warring States policy a": "See said Zhao Yu Hua under house, arrived in charge of the talks, Zhao Wang Taiyue." 　　Examples: Good speech by ~, and asked all the things the earth. (Lu Xun "on world travel" back to XIII)