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。
Mode of vibration
原声例句
TED-Ed（视频版）
宇宙奥秘
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。
英语百科
Normal mode
（重定向自Mode of vibration）
A normal mode of an oscillating system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation. The free motion described by the normal modes takes place at the fixed frequencies. These fixed frequencies of the normal modes of a system are known as its natural frequencies or resonant frequencies. A physical object, such as a building, bridge or molecule, has a set of normal modes and their natural frequencies that depend on its structure, materials and boundary conditions.
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