A title of respect for the immediate superior.

In ancient times, the title of respect for the immediate superior was adult. In ancient times, people with distinct social classes and different status had strict address and etiquette requirements. Adults, as a general and commonly used honorific title, can show respect for senior leaders of elders or officials, as well as people with profound knowledge and noble moral character. Therefore, it is one of the most common, appropriate and profound manifestations in traditional culture to use adults when treating your immediate boss.