decibel
/ˈdesɪbel/(缩略词：dB)
noun
1- a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale分贝。
1.1
- (in general use) a degree of loudness（一般用语）响度：
his voice went up several decibels.
他的声音提高了几度。
词源