Copper coins, ancient coins! What do you mean by turning your back on Guo? What do you mean by rotating your back? What does the hidden Guo mean? Sky-high reward ~ ~

I think the picture can best explain the problem, hoping to help the landlord!

Anti-Guo: The so-called anti-Guo means that the four sides of the inner Guo are slightly bent inward. If the front inner Guo has this feature, it is called "face Guo". If the inner Guo on the back has this feature, it is called "reverse Guo". The main characteristics of the anti-Guo are that the four sides of the anti-Guo are bent and the four corners are not prominent; Four sides are straight, but four corners extend outward. ?

Cycle can be divided into big spin, small spin and depth.

Hidden Guo means that the inner wear is lower than the text and the Guo is thin. Unfortunately, the picture can't be uploaded.