Strings can vibrate in many different ways at once. In addition to the entire length of the string bending back and forth, the string can also vibrate in halves, in thirds, in quarters, and so on. These vibrations of string subsections are called harmonics (or overtones, or partials, they all mean the same thing.)
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YY直播一直保持盈利，喜马拉雅、叮咚买菜被并购时已达“盈利边缘”。说明即使是巨头，也不敢轻易入手巨亏的公司，怕背上包袱。一旦他们看中的标的盈利在望，就迫不及待地扑上去。
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