短語詞組短語secondary undulation 次波動;副振動tidal undulation 潮振動;潮位升降undulation point 起伏點local undulation 局部波動Chest Undulation 胸部波浪undulation fold 波狀褶皺sand undulation 起伏沙丘stocks undulation 股票風(fēng)云 返回 undulation