跳伞在中华人民共和国建国之初曾经作为国防体育运动在全国普及，一度十分流行。但显然这种在高空翱翔的体育项目不比游泳、跑步，还需要具备相当专业的技术支持。因此，为了加强对青少年跳伞运动的训练，当时全国的各大城市中几乎都修建了高耸入云的跳伞塔，有的甚至还成为地标性建筑。时过境迁，如今全国的跳伞塔在城市发展中大部分被拆除，跳伞也日渐回归军事训练，从而退出群众性运动的历史舞台。北京跳伞塔是新中国成立之后修建的第一座伞塔，它矗立在风景秀丽的龙潭湖畔。1955年破土动工，年底竣工，高54.17米。1955年北京市跳伞运动俱乐部成立后，很快地吸引了成千上万的干部、工人、学生。在短短两年多的时间内，参加了跳伞运动的已有八万多人次。1980年代，跳伞项目在体育比赛中被取消，全国群众性的跳伞运动也随之衰落，伞塔也失去了其固有作用，日渐成为被遗忘的荒芜之地。北京跳伞塔如今被包围在某个研究所的院子中，早已无法靠近。我们只能在紧靠院子的居民区远望废弃多年的伞塔。
Parachuting, as a national defense sport, was once widely promoted across China at the beginning of the founding of the People's Republic of China and became very popular for a time. However, unlike swimming or running, this sport, which involves soaring in the sky, requires substantial professional technical support. Therefore, to enhance training for young people in parachuting, almost every major city in the country constructed towering parachute towers, some of which even became landmark buildings. Over time, however, as cities developed, most of these parachute towers were dismantled, and parachuting gradually returned to being a military training exercise, thus fading from the stage of mass sports.
The Beijing Parachute Tower, the first of its kind built after the founding of New China, stands on the picturesque banks of Longtan Lake. Construction began in 1955 and was completed by the end of the year, standing 54.17 meters tall. After the Beijing Parachuting Sports Club was established in 1955, it quickly attracted thousands of cadres, workers, and students. In just over two years, more than 80,000 people participated in parachuting. In the 1980s, parachuting was removed from competitive sports, and the nationwide mass parachuting movement gradually declined. As a result, the parachute towers lost their original function and became forgotten, desolate places. Today, the Beijing Parachute Tower is surrounded by a research institute's compound and is no longer accessible. All we can do now is look at the abandoned tower from the nearby residential area.
cache is a triangle stuff on the wall