短语词组短語secondary undulation 次波動;副振動tidal undulation 潮振動;潮位陞降undulation point 起伏點local undulation 侷部波動Chest Undulation 胸部波浪undulation fold 波狀褶皺sand undulation 起伏沙丘stocks undulation 股票風雲 返回 undulation