1·The scale of urban population has become one of the most important research fields in urban science because of its mutability and the importance of determining it.
城市人口规模的易变性及界定的重要性使其成为城市科学中重要的研究领域。
1·In view of the mutability in deformation and failure of the rock mass, and combined with the theory of the material mechanics, a cusp catastrophe model of rock beam-pillar was build.
针对岩体变形破坏具有的突变性，结合材料力学理论，建立了岩梁-矿柱的尖点突变模型。