primary detector的用法和樣例：
例句
- Signal display on battery weakness and detector failure.
電池轉弱及感測器損壞提示檢查。 - The distance between the acoustic-emission source and the receiving transducer, and the background noise level are primary factors in selecting a particular frequency band.
聲發射源與接收訊號感測器間的距離以及環境雜訊的電平是選擇頻帶的主要依據。
