on-line measurement and frequency spectrum method

例句：

1. 1. The on-line measurement system is highly accurate and efficient.
   这个在线测量系统非常准确且高效。
2. 2.The frequency spectrum method provides a unique perspective on the behavior of complex systems.
   频率谱方法为复杂系统的行为提供了独特的视角。
3. 3.The on-line measurement and frequency spectrum method was used to analyze the data collected from the experiment.
   使用在线测量和频谱分析方法来分析实验收集的数据。