首頁›Browse›P›perfect fourthperfect fourth編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看perfect fourthperfect fourth — 名詞名詞1. a musical interval of four diatonic steps, spanning five semitones1.名詞釋義完全四度a musical interval of four diatonic steps, spanning five semitones例句The perfect fourth is a consonant interval in music theory.