decibels above I milliwatt

例句：

1. 1. The sound level is measured in decibels.
   声音水平用分贝来衡量。
2. 2.The loud music was drowned out by the decibel of the explosion.
   爆炸声淹没了音乐的分贝。
3. 3.The speaker used a microphone to reduce the noise to a safe level.
   演讲者使用麦克风将噪音降低到安全水平。