noise limiting

例句：

1. 1. The noise limit is set to 85 decibels at night.
   夜间的噪声限值为85分贝。
2. 2. The noise limit for this area is 70 decibels.
   该地区的噪声限值为70分贝。
3. 3. The noise limit is exceeded when the volume of sound is above the specified level.
   当声音的音量超过指定水平时，噪声就超标了。