名词
中文翻译：主要振动模式
同义词：
['principal mode', 'main mode', 'fundamental mode']
例句：
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1.The sound waves are propagating through the air at a principal mode.
声波以主模态传播通过空气。
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2.In acoustics, the principal mode is the one that gives rise to the most significant frequency components.
在声学中，主模态是产生最显著频率成分的那个。
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3. The vibration of the spring is primarily due to its elasticity.
弹簧的振动主要是由于其弹性所致。