manual volume control

例句：

1. 1. To adjust the volume, press the up arrow on your remote control.
   要调整音量，请按遥控器上的上箭头。
2. 2. The manual volume control allows you to fine-tune the sound for a more personalized listening experience.
   手动音量控制允许您精细调整声音，以获得更个性化的聆听体验。
3. 3. The manual volume control is useful when using headphones or earbuds that don't have built-in volume controls.
   当使用没有内置音量控制的耳机或耳塞时，手动音量控制非常有用。