形而上学者们认为,要创新就要一切皆新, 把前人的经验一概抛开。这是把继承和创新、学习和创造的关系绝对化起来了。任何科学技术都是在原有的科学技术基础上发展起来的,都不能割断科学技术发展的历史,而应当在继承中革新,学习中创造。无后背双向顶管法就是在学习外单位长距离顶管法施工的基础上发展起来的。 Metaphysicians believe that if we want to innovate, everything must be new, and we must put aside the experience of our predecessors. This is to absoluteize the relationship between inheritance and innovation, learning and creativity. Any science and technology are developed on the basis of the original science and technology. Neither can we cut off the history of the development of science and technology, but we should innovate in inheritance and create in learning. The back-to-back two-way pipe jacking method was developed on the basis of learning the construction of the long-distance pipe jacking method of foreign units.