wavelike motion; a gentle rising and falling in the manner of waves
(physics) a movement up and down or back and forth
undulation的用法和样例：
例句
用作名词 (n.)
As an assistant one to the shipping industry,which is fluctuated with the undulation of the shipping. 船供行业作为航运业的一个辅助行业也会随之波动而受到影响。
Factor effecting injection quantity uniformity were briefly analyzed, and the undulation quantity and injecting pulse revising was put forth to meet the respective demand. 简要分析电控喷油器的均匀性影响因素，提出了压力波动量控制的办法和喷油脉宽修正的办法满足小喷油量均匀性要求。
When a gust of wind blows across the sea-like desert, the undulation of the sand has the shape of the wind imprinted on it. 当万里长风吹过翰海，沙的起伏留下了风的形状。
But some unexpected enthusiasm and undulation are needed under the rational business imprints. 但是理智的商业印记下，也需要一些出乎预料的激情和起伏。
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