名词
中文翻译：Unknown
同义词：
['flutter', 'quiver', 'tremble', 'shudder']
例句：
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1. The butterfly's wings were fluttering in the breeze.
蝴蝶的翅膀在微风中扑动。
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2. Her hands were trembling as she held her breath.
她紧握着呼吸，手在颤抖。
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3. The ship rocked back and forth on the choppy sea.
船只在汹涌的海浪中颠簸摇摆。