Why does the song in the cloud of love only say and promise?

The voice of agreement between people in Qin and Han dynasties expressed agreement; Only Nuo Nuo. "Wei" and "Nuo" in the Qin and Han Dynasties are both onomatopoeic words, and they are both answering voices. But "promise" refers to the response of people with high status or seniority to subordinates or younger generations. "Wei" refers to the response of people with low status or seniority to people with high status or seniority. The difference between the two is that "only" is urgent, "promise" is soothing, "slow response is promise, and illness is only". You should reply quickly with the word "micro" to show your respect, instead of using the word "promise" calmly. If you are serious, you should also answer with "sincere promise" instead of "promise".

For example, in the Qing Dynasty, the subordinate's answer to the superior was "Hey".