It's a long way to the north of the Great Wall and a vast territory, and the war in the south of the city is fierce.
The flag is hunting, like the wings of a bird; The helmet is bright, like the scales of a fish.
The cold water is very cold, which frostbite horses, makes people feel bleak in the cold wind and worries people's hearts.
Tiny thoughts also express people's bright inner world; The journey is thousands of miles, and the desert flies sand, covering the sky and the sun.