Tip: Around the Zhou Dynasty, stone tablets appeared in palaces and ancestral halls, but their functions are different from today's stone tablets. The stone tablet in the court calculates the time according to the change of the shadow position it casts in the sun; The stone tablet in the ancestral hall is a stone pillar used to tie livestock for sacrifice.

Mystery: there are thousands of words on the back, but there are no words on the back. Counties in Taiwan Province are the first, and tributes are the last. Answer: Stone riddle: Born in a high mountain, standing on a flat ground, not reading poetry, full of literary spirit. Answer: stone tablet.