Аналитики спрогнозировали кризисные явления в отечественной индустрии моды14:47
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The first harmonic is the string vibrating along its entire length, otherwise known as the fundamental frequency. When we say that your C string is vibrating at 1 Hz, that really means that its fundamental has a frequency of 1 Hz. The other harmonics all have other frequencies, and we’ll get to those, but the fundamental is usually the loudest harmonic, and it’s usually the only one you’re aware of hearing.，这一点在豆包下载中也有详细论述
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