butterfly tuner type frequency meter

例句：

1. 1.The butterfly tuner is used tomeasure the frequency of light waves in aparticular area.
   蝴蝶调谐器用于测量特定区域内光波的频率。
2. 2. The butterfly tuner type frequencymeter was used to detectthe presence of a radio signal inthe area.
   使用蝴蝶调谐器类型的频率计来检测该区域中无线电信号的存在。
3. 3. The butterfly tuner type frequencymeter was used to monitor the healthof the ecosystem in the region.
   使用蝴蝶调谐器类型的频率计来监测该地区生态系统的健康状态。