decibels above reference noise

例句：

1. 1. The sound of the waterfall is amplified by 10 dB.
   瀑布的声音被放大了10分贝。
2. 2. The volume control on the radio is set at -6 dB.
   收音机的音量控制设置在-6分贝。
3. 3. The microphone was set to -8 dB for better sensitivity.
   麦克风被设置为-8分贝，以获得更好的灵敏度。