LF spectrum analyzer

例句：

1. 1.This LF spectrum analyzer is used to measure the frequency of light in a room.
   这个低频谱分析仪用于测量房间内光的频率。
2. 2. The engineer used the LF spectrum analyzer to detect the presence of water vapor in the air.
   工程师使用低频谱分析仪检测空气中是否存在水蒸气。
3. 3.The LF spectrum analyzer was used to study the behavior of molecules in different environments.
   低频谱分析仪被用来研究不同环境中分子的行为。