例句與造句

1. Examples of omnidirectional electronic sirens are the Federal Signal EOWS1212, Federal Signal Modulator series, Whelen Engineering WPS2700, WPS2800, and WPS2900, > ATI HPSS and American Signal I ~ Force, in which compression drivers located in each cell exit into the center of the cell.
2. It's difficult to find signal modulator in a sentence. 用signal modulator造句挺難的