重点词汇
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倍频
frequency multiplication; frequency doubling; harmonic frequency
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范围
range; scope; extent; limits; boundary; sphere; domain; spectrum; ambit; compass; purview; pale; cover
octave coverage
倍频
frequency multiplication; frequency doubling; harmonic frequency
范围
range; scope; extent; limits; boundary; sphere; domain; spectrum; ambit; compass; purview; pale; cover