VERB 波动;起伏;摇曳 Something that undulates has gentle curves or slopes, or moves gently and slowly up and down or from side to side in an attractive manner. 波动;起伏;摇曳 [literary] [Also VERB n]
As we travel south, the countryside begins to undulate as the rolling hills sweep down to the riverbanks. [VERB]
我们一路南行,乡间开始变得起伏不平,绵延的山峦一直延伸到河岸。
His body slowly undulated in time to the music. [VERB]