undulate /ˈʌndjʊˌleɪt/ TEM8 ( undulating, undulated, undulates )

• 1. 

  V-I 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. 连绵起伏 [文学性]

  例：

  As we travel south, the countryside begins to undulate as the rolling hills sweep down to the riverbanks.

  随着我们游向南边，乡间的山丘变得连绵起伏与河岸相接。

• 2. 

  undulating ADJ

  例：

  ...gently undulating hills.

  ...平缓起伏的小山。