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[It's a cool article about double-passing doors, please don't get too precise about the details. Jia Tang gets a bronze mirror, which allows him to travel between the Red Mansion and the modern world. He arrives at the northern border at the time of the barbarian invasion. Seeing the people being massacred by the barbarians, Jia Tang finally decided to help. The people asked, "What are you doing here, young master?" Jia Tang: "Protect a city." The common people asked, "How can you protect the city with your own strength?" Jia Tang: "It is enough for one person to defend a city with one gun!" On Wangbei City, Jia Tang set up a Vulcan Gatling machine, with hundreds of thousands of bullets piled next to it. This was his one-person shot!