If a vibrating string is lightly touched at its midpoint , its pitch goes up an octave.

如果在一根振动弦的中部轻轻一触, 它就发出高八度的音.

辞典例句

Firstly, a perturbation and spaced eigenvalue problems of vibrating string is presented.

首先讨论了弦振动的孤立、相近特征值摄动问题.

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