Undulate

(verb.) increase and decrease in volume or pitch, as if in waves; 'The singer's voice undulated'.

(adj.) having a wavy margin and rippled surface .

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• Again--a fine, full, lofty tone, a deep, soft sound, like a storm whispering, made twilight undulate. 夏洛蒂·勃朗特. 雪莉.
• There was about it an undulating and aerial grace, such as one might dream of for some mythic and allegorical being. 哈丽叶特·比切·斯托. 汤姆叔叔的小屋.
• On a rainy day, even in a gently undulating country, we see the effects of subaerial degradation in the muddy rills which flow down every slope. 查尔斯·达尔文. 物种起源.
• Then the unthinkable high vibration slackened and became more undulating. 戴维·赫伯特·劳伦斯. 恋爱中的女人.
• Sometimes the undulating movement was noticeable, but that was all. 鲁伯特·萨金特·荷兰. 历史性发明.

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