What does it mean to send a bow to defend Yu Yangfa?

Lu Zuo's explanation [the place where the poor lived; The poor people living on the left side of the inner gate are the areas where the ancient poor lived, and also refer to the poor, that is, civilians. Referring to soldiers Chen Sheng and Guangwu guarding the border, they began to defend Yuyang. ? Historical records? Chen She aristocratic family "has become a leftist child. ? Ming? Gao Qi explained in detail the people living on the left side of Lv Xiang in Shubo Chicken Tale. Speaking of the Qin dynasty, the poor lived in the left, and later referred to civilians. "Historical Records Chen She Family": "In July of the second year, I was left to defend Yuyang. Sima Zhen Suoyin said, "Left-handed people are left-handed, and those who were eliminated in Qin Dynasty were left-handed. Today's army service is made by Lu Zuo. It is also a cloud. Those who live well are right, and those who are poor are left. There are many wars in Qin, and the rich are tired, and the poor are weak. "History of Food in Hanshu": "As for the first emperor, he was in harmony with the world, prospered from the inside, conquered barbarians from the outside, and was blessed by Thailand and made a left defense. "Yan Shigu's Note:" Ying Shao said:' Qin should issue it, and the name should be kept. First, there were married officials, then they had citizenship, and then they had citizenship with their parents. Cao Cao, the garrison commander, exhausted his generation and returned to Lu. He took it from the left and did not take it from the right. Qin died. "Lu, the inner door is also. People who speak on the left side of the inner door will speak out loud. Zuo Zuo's interpretation is the most worthwhile. " Tang Chenziang's "On Turkic Representing Joe": "Therefore, the Great Wall has not been completed, and the defense of Zuo Zuo has been disturbed by it." Wei Yuan's Meditation for Nine Rulers in the Qing Dynasty: "The readers of the DPRK, that is, the books published by scholars, ignored a scholar's good skills and failed to pay attention to the past during the ten days. "The explanation of word decomposition is that twenty-five ancient families are one family. Originally refers to the gate of the alley, and later refers to the place where people live: leaning on it to see. Green power and green fragrance. Lu Zuo (a poor man who lived on the left side of the inner gate in the Qin Dynasty). Confluence: Tail (where water meets and where water is discharged). Number of strokes:; Radical: door; Interpretation of the left stroke order When the left foot faces south, the east side is opposite to the "right": the left hand. To the left About. Geographically, it refers to the east: the mountains are on the left. Jiang Zuo refers to the radical thoughts and behaviors that are progressive in political thought or beyond the realistic conditions: Left deviation. Left wing. Left leaning. Deviation, deviation, error: left temper. An out-of-tune sound