"Nai" is a usage in ancient Chinese, which means emphasis, equivalent to "that is" and "just". In ancient times, people often used "Nai" to emphasize the authenticity and importance of a situation. For example, in "The Analects of Confucius", "Learn and practice from time to time, don't you just say it", "Those who know are not as good as those who are good at it, and those who are good at it are not as good as those who are happy", all use "Nai" to emphasize the authenticity and importance of speech. sex. Therefore, "Nai" is an ancient and important word in Chinese.
In ancient times, people often used "Nai" to express the time when an action or situation occurred. For example, Bai Juyi, a poet of the Tang Dynasty, wrote in "Song of Everlasting Sorrow": "There is a person in the middle, with a face like the moon, eyebrows like a willow, handsome and graceful, tall and slim" (where "middle" is the word "Nai" which means time). Here, "Nai" means "at this time" and is used to introduce a new situation.
"Nai" was also often used in wording in ancient times, and was sometimes used in conjunction with other words to express an objective fact or situation. For example, "Tai Gong is floating in the East China Sea" in "Han Shu", which uses "Nai" to emphasize the true existence of Tai Gong, and he did establish a small country on the edge of the East China Sea. Therefore, we can see that "Nai" was a very common word in ancient times with a wide range of uses. It can be seen in many ancient books.