What are the origins of Shuangjing, Shuangqiao, Shuang Yuan and Shuangshu in Beijing?

There used to be a large area of farmland outside Guangqumen, most of which were vegetable gardens. Among them, Yao's vegetable garden is the largest, with more than 40 acres. There are two wells in the vegetable garden, one in the northwest and the other in the southeast, which are only more than 20 meters apart. Because there is a country road on the south side of the vegetable garden, pedestrians passing in and out of Guangqumen pass by and rest under the big willow tree by the well, so it is called Shuangjing. Later, the vegetable garden disappeared and the well disappeared, but Shuangjing was still a place name.