When the river rises and falls, it loses momentum. The mountains are like dancing silver snakes, and the highlands are like advancing wax elephants, all trying to match the sky in height.

(1)C(2) the condescending metaphor is personified and exaggerated (3) the snow scene in the north is both inside and outside the Great Wall, but it is boundless; Up and down the river, I lost the original wax elephant of Agkistrodon dancing on the rough mountain, trying to describe the weather (4)