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复数形式
undulations
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波动, 起伏
(physics) a repeated movement or fluctuation, likened to the rise and fall of waves
- To understand the properties of light, it's crucial to study its undulation, especially when it encounters different surfaces.
为了理解光的特性，研究其波动至关重要，尤其是当它遇到不同的表面时。
- The study focused on the undulation patterns of sound waves as they traveled through various mediums.
该研究重点研究了声波在穿过不同介质时的波动模式。
同义词：
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波动, 波浪运动
a wavelike motion characterized by a smooth, gentle rising and falling
- The gentle undulation of the sea surface was therapeutic to watch.
海面的轻柔波动看起来有治疗效果。
- With each gust of wind, there was a soft undulation in the field of wheat.
随着每一阵风，麦田里都有轻柔的波动。
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