undulate (no object)
不及物用法，表示主体自身波动。
The wheat field undulated in the breeze.
麦田在微风中起伏。
起伏；波动
undulating — present participle of undulate
使起伏；使呈波浪形；使作波浪状运动；使起伏。；使似波浪；使呈波状。；作波浪状运动；起伏。；呈波浪状；现出波状。
to move or appear in wavelike motions
使作波浪状运动；使起伏。
To cause to move in a wavelike motion.
使似波浪；使呈波状。
To cause to resemble a wave.
作波浪状运动；起伏。
To move in wavelike motions.
呈波浪状；现出波状。
To appear wavelike.
一般现在时
The snake undulates smoothly.
蛇平滑地蜿蜒前进。
一般过去时
The wheat fields undulated in the wind.
麦田在风中起伏。
现在进行时
The dancer's body is undulating to the music.
舞者的身体随着音乐起伏。
规则动词，加-ed和-ing。
The wheat field undulated gently in the breeze.
麦田在微风中轻轻起伏。
用法提示：undulated 是动词过去式，表示随风做波浪状起伏。
The dancer's arms undulated like waves.
舞者的手臂像波浪一样摆动。
用法提示：undulated 作谓语动词，描述像波浪般的连续动作。
As the boat moved forward, the rope began to undulate.
船向前行驶时，绳子开始波动。
用法提示：undulate 是不及物动词，此处用不定式表示呈波浪形运动。
不及物用法，表示主体自身波动。
The wheat field undulated in the breeze.
麦田在微风中起伏。
及物用法，表示使某物起伏或波动。
The magician undulated the silk scarf with a flick of his wrist.
魔术师手腕一抖，使丝巾呈波浪形飘动。
grammar · medium
易错句子We saw the undulate of the hills.
正确表达We saw the undulation of the hills.
“波动” 是动词，名词形式应为 “undulation”。
grammar · medium
易错句子The stock market undulates daily.
正确表达The stock market fluctuates daily.
“undulate” 指物理上的波动起伏，抽象变化用 “fluctuate”。
undulate 指物理上的波浪形运动，而 fluctuate 指数量或程度上的不规则变化。
undulate 描述连续起伏的运动，而 wave 既可指挥手动作，也可指水面波浪。
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