This paper presents an efficient method of modelling jointed rock by using the boundary ele-ment method via the concept of multiregion and non-linear model of joint and fault. 边界元法广泛应用于岩石力学问题的最大障碍是岩体的非均质及其包含的大量节理断层，本文采用多子域思想结合节理断层的非线性模型较好地解决了这一难题。
Utilization and fixation of the distant heterosis in rice by one line method has been an exploratory work in rice breeding with great enticement and difficulty. 通过一系法利用和固定水稻的远缘杂种优势是一项具有极大诱惑力但难度颇大的科研难题。
