Stone, stone

It shows that Shi Jie thinks on the basis of observation, and reasonably explains the reasons for the change of things, the relationship between things, or the law of the development of things.

Yiyi

The post exhibition is a place where people or officials who delivered official documents and military information exchanged horses and chariots on the way in ancient China.

Translation is easy

Fan Yi translation is the act of translating information from one language into another on the basis of accuracy and fluency.

Zeze

Select Xuanze, and select one or more of them.

Yiyi

Deduct the significance of Yi Yan's layout and performance.