Sirius means Sirius. In ancient astrology, it was considered as the main invader, which meant Liao and Xixia between the lines. The author regards it as a symbol of the enemy and uses the association that "wolf" belongs to the beast. When it was in the ranks of being hunted, he said that he would hold a strong bow with carved flowers, condense his hatred against the enemy on a bow string as round as a full moon, take a good look at the enemy in the northwest and shoot hard.