preset frequency

例句：

1. 1.The device has a preset frequency for adjusting the volume.
   该设备具有预设频率，用于调整音量。
2. 2.The radio station sets its preset frequency for the morning news.
   该广播电台设定了其预设频率，用于播放早间新闻。
3. 3.The car's engine has a preset frequency that can be adjusted by the driver.
   汽车引擎的预设频率可以通过驾驶员进行调整。