law of difference meaning in English

差异律

For verifying the level of design about space structure and investigating the law of difference between practical internal force and internal force of design about member and nodal point , controlling the stress correctly and achieving optimum design . it is important that we investigate a new stress detecting technology which is easy used and has aptitude function for detect the internal force of long - span space structure . this topic take it as background
因此，为了检验大跨结构的设计水平，进行在役结构的可靠性评定，研究这类结构各杆件及节点的设计内力与实际值之间的变化规律，从而对其进行较为准确的控制并进行优化设计，寻找一种新的便于携带、使用可靠且具有一定智能功能的应力检测系统，用于测试大跨结构杆件及节点的实际内力就显得尤为重要，并且也具有很强的开发和应用前景。