vi.起伏，波动，呈波浪形，震动
vt.波动，使波动，使起伏，使成波浪形
adj.波状的，波动起伏的，波浪形的
His body slowly undulated in time to the music.
他的身体随着音乐的节拍慢慢摆动。
The ripe wheat undulated in the Breeze like the incoming tide.
成熟的小麦象潮水般随风起伏.
The sail undulated gently in the breeze.
帆在微风中缓慢地波动.
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