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undulate/
ˈʌndjʊleɪt
ˈʌndjʊlɪt
/
1.vt.
使泛起涟漪，使波动
2.vi.
起伏，绵延
3.vi.
波动，上下起伏，左右摆动
4.vi.
（声音）忽高忽低
5.adjective
起伏的；波动的