Pythagorean comma (PC) defined in [[Pythagorean tuning as difference between semitones (A1–m2), or interval between enharmonically equivalent notes (from D to C). The diminished second has the same width but an opposite direction (from to C to D).
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。