nodal-point keying

例句：

1. 1. In network design, node keying is used to identify the nodes in a network.
   在网络设计中，节点键是用来标识网络中的节点的。
2. 2.The nodal-point keying method is widely used in power systems for fault detection and isolation.
   节点键法在电力系统中广泛使用，用于故障检测和隔离。
3. 3.In this study, we applied the nodal-point keying technique to analyze the dynamic behavior of the system.
   在本研究中，我们应用了节点键技术来分析系统的动态行为。