main joint meaning in English

众理
主接头
主节理

Main joint projects
主要合作计划
4 . because there are sub - elements in a member with the introduction of inner joints , when tile spatial stifmess matrix of main joints of a member is made , there are some cases of solving the double nonlinear equations , negative stifmesses , and singular stiffness matrices in process of iterating
4 、由于引入了内结点，构件存在子单元，在形成主节点的构件空间单元刚度矩阵时，存在双重非线性方程求解，迭代过程中负刚度和刚度矩阵奇异问题。
Firstly , according to the natural geology study of the quarry , the control structure planes are determined , which are cut to be building blocks by two sets of main joints . failure can occur due to the intensity weaken of the joint planes caused by excavation relief and rain immersion
首先研究了采场的自然地质条件，确定了影响边坡稳定的控制性结构面，即块体主要由两组节理切割而成楔形体，由于开挖卸荷及雨水浸泡，致使节理面强度减弱而发生破坏。