Question

What do four kinds of lines that depict the great wall refer to

Answer 1

The four kinds of lines that depict the great wall refer to the four dynasties represested on the wall.

Step-by-step explanation:

The Great Wall of China was built to consolidate the Qin Shihuang empire. Before gaining control of China, the Chinese states each had their own wall.

To show that China was one, the first Chinese emperor - Qin Shihuang - ordered the construction of the Great Wall, which was done over four dynasties: Zhou (1046 to 256 BC), Qin (221 to 207 BC), Han (206 BC to 220 AD) and Ming (1368 to 1644).

It was intended to protect the country from the invaders and also to occupy rowdy men and soldiers who at the end of the wars were without work.

Answer 2

The four kinds of lines that depict the great wall refer to the four dynasties that build the wall. These four dynasties are
Zhou, Qin, Han, and Ming dynasties
The wall was built to protect the country from outside raiders