M-mode ultrasonic scanning

例句：

1. 1.The engineer used a M-mode to measure the thickness of the steel beam.
   工程师使用M-模式来测量钢梁的厚度。
2. 2. The M-mode was used to detect the fault in the pipeline.
   M-模式被用来检测管道中的故障。
3. 3.The M-mode is a useful tool for analyzing complex systems.
   M-模式是一种有用的工具，用于分析复杂的系统。