loudness unit

基本解释

The decibel is the unit used to measure the loudness of sound.
分贝是用来测定声音大小的单位。
TV sets and radios add up to 90 or J00 decibels, a certain unit used to measure the loudness of sound.
电视机和收音机加起来90或J00分贝，某单位用来测量声音的响度。
Sound is a form of energy transfer and we could define loudness in terms of the energy per unit of time or power output of the sound, but it wouldn't give the complete picture.
声音是能量传递的一种形式，我们可以用单位时间内的能量，或声音产生的能量来为衡量响度，但这还不全面。
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