Kao (pinyin: KO) is a first-class word (commonly used word) in the General Standard of Chinese. In Oracle Bone Inscriptions and Jin Wenzhong, Kao and are always the same word, both of which are in the shape of an old man with a stick? .

Textual research, as the meaning of old age, lasted from Shang Dynasty to the Spring and Autumn Period and the Warring States Period. In the pre-Qin period, "Kao" was often used to address father, which could refer to the living or the dead. "Kao" in modern Chinese is mostly used for examination and assessment, and it also means research and deduction. These are all borrowed meanings, which have nothing to do with the original meaning of the exam.

There is also a "Kao" in Chinese characters, which is pronounced from the pronunciation of "."The original meaning is "strike". "Examination" is often disguised as "examination", and over time, "examination" assumes the function of "examination".

Su Shi sighed at the end of "Shi Zhongshan Collection": "And the poor people ask for it with axes, and they think they are true." "Examination" means "knocking". Later, the borrowed meaning of "knock" developed into the meaning of "investigation", "textual research" and "textual research".

Another "Er Ya Qin Shi": Father is a test. Textual research on father's death year. Test, into also. In other words, it is also a question of righteousness and success. Where five materials are used to mold leather, it is also a dry problem. "An Ancient Gua": It's not strange to have a son test. A textual research on the year of death in the rite of passage.

Guangyazai: a textual research. "Yi Fu Gua": I don't regret when I answer. I will take the exam myself. Elegant poem: Cowboy King. Chuan: You did well in the exam.

Another book, Zhou Guan: Examination System in Four Mountains. Note: Examination and marking system.

Another poem, Feng Wei: A Study in a Stream. Chuan: Take the exam and succeed. Zuo zhuan lived in seclusion for five years: Kao Zhong's womb. Note: This place has become the palace of Zhonggu.

Another poem, Tang style: there are bells and drums, and there are drums. Pass: Test and Strike.

On Xun's "Huang Can Can't Be Examed" in Huai Nan Zi. Note: Test, defect.

Another "Nine Sighs of Chu Ci": I am haggard and anxious. Note: The exam is over.