That gives it three modes of vibration: symmetric stretching, asymmetric stretching, and bending.

对称拉伸，非对称拉伸，和弯折。

What makes string theory so elegant, is that it describes many different elementary particles as different modes of vibration of the string.

弦理论之所以会如此精美，是因为其用了各异的震荡模式描述了基本粒子。