| 单词 | phon |
| 释义 | phon /fon/, n. a unit for measuring the apparent loudness of a sound, equal in number for a given sound to the intensity in decibels of a sound having a frequency of 1000 cycles per second when, in the judgment of a group of listeners, the two sounds are of equal loudness. [1930-35; < Gk phoné voice] |
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