primary detector的用法和樣例：
例句
- Signal display on battery weakness and detector failure.
電池轉弱及傳感器損壞提示檢查。 - 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(fā)射源與接收訊號傳感器間的距離以及環(huán)境噪聲的電平是選擇頻帶的主要依據。
