1
undulation of [sth]
用于描述地貌或物体的波状起伏。
The undulation of the plain made the road seem endless.
平原的起伏使道路显得一望无际。
波动；起伏；波状弯曲
先理解核心含义，再看它在真实句子里的用法。
波动；起伏；波状弯曲
wavelike motion; a gentle rising and falling in the manner of waves
The undulation of the plain made the road seem endless.
平原的起伏使道路显得一望无际。
波动的实例或动作。
An instance or act of undulating.
波浪状的外观或轮廓；起伏。
A wavy appearance or outline; waviness.
用手指在琴弦上施加特殊压力产生的颤音。
A tremulous tone produced by a peculiar pressure of the finger on a string.
波状曲线；平稳而有规律的起伏。
A wavelike curve; a smooth and regular rise and fall.
The gentle undulation of the hills made the drive very relaxing.
山丘的平缓起伏使这次驾车非常轻松。
She watched the undulation of the wheat in the wind.
她看着风中麦浪的波动。
The snake moved with a smooth undulation across the sand.
蛇在沙地上平滑地起伏前进。
用于描述地貌或物体的波状起伏。
The undulation of the plain made the road seem endless.
平原的起伏使道路显得一望无际。
用于描述数据或状态的波动变化。
Doctors observed an undulation in the patient's blood pressure.
医生观察到患者血压的波动。
使用复数形式，强调多次或连续的波动。
The undulations of the melody gave the music a soothing quality.
旋律的起伏赋予了音乐一种舒缓的特质。
Not this
The flag undulation in the wind.
Use this
The flag undulates in the wind.
“undulation”是名词，不能作谓语动词；应使用其动词形式“undulate”。
Not this
There is many undulation in the desert.
Use this
There are many undulations in the desert.
“undulation”作为可数名词（表示具体波动），应用复数形式“undulations”，且谓语动词用复数。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
平缓起伏
From the hilltop, we saw the gentle undulation of the landscape.
从山顶上，我们看到地形的平缓起伏。
有节奏的起伏
The dancer's rhythmic undulation captivated the audience.
舞者有节奏的起伏动作令观众着迷。
丘陵的连绵起伏
The undulation of the hills stretched to the horizon.
丘陵的连绵起伏一直延伸到地平线。
平滑的波状起伏
The roller coaster moved with a smooth undulation.
过山车以平滑的波状起伏移动。
Use undulation naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：undulation 的字母 u-n-d-u 像高低起伏的波浪线，u 是谷、n 是峰，记住“波动、起伏”。
语域：formal 常见场景：scientific writing、formal description、literary prose 在表示波浪状运动或起伏时，undulation 通常偏正式，多用于科技或文学描写；日常口语中较少用，更常说 wave 或 rise and fall。
以上六个词都与 undulation 押韵：重读音节均为 /ˈleɪʃən/，-ulation 的读音一致。注意拼写相近的词不一定同音：如 undulate /ˈʌndjʊleɪt/ 重音在前、结尾是 /leɪt/，和本词不押韵；lotion /ˈləʊʃən/ 虽也以 -tion 结尾，但元音不同，也不押韵。
Dictionary facts from ECDICT, WIKTIONARY.