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伊朗米纳卜小学遭袭事件发生后，巴赫雷尼曾分别致信联合国人权事务高级专员沃尔克·图尔克和暴力侵害儿童问题秘书长特别代表，要求对美国和以色列犯下的罪行进行谴责并展开调查。（新华社）
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In 12-TET, you divide up the octave into twelve equally-sized semitones (the interval between two adjacent piano keys or guitar frets). To go up a semitone from any note, you multiply its frequency by the 12th root of 2 (about 1.05946). To go down a semitone from any note, you divide its frequency by the 12th root of 2. If you go up by an octave (twelve semitones), you’re multiplying your frequency by the 12th root of 2 twelve times, which works out to 2. That’s a perfect octave, hooray! Unfortunately, you can’t exactly create the other harmonics-based intervals by adding up 12-TET semitones; you can only approximate them.
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