1. having a wavy margin and rippled surface

1. stir up (water) so as to form ripples

2. occur in soft rounded shapes;

   "The hills rolled past"
   

3. move in a wavy pattern or with a rising and falling motion;

   "The curtains undulated"
   "the waves rolled towards the beach"
   

4. increase and decrease in volume or pitch, as if in waves;

   "The singer's voice undulated"
   

1.波动；起伏；摇曳
Something thatundulates has gentle curves or slopes, or moves gently and slowly up and down or from side to side in an attractive manner.

e.g. As we travel south, the countryside begins toundulate as the rolling hills sweep down to the riverbanks...
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。
e.g. His body slowly undulated in time to the music.
他的身体随着音乐的节拍慢慢摆动。

1. 起伏：tug#拖曳 |undulate#起伏 | unearth#发掘;发现

2. 波动;波状的：undulate fold 波状褶皱 |undulate 波动;波状的 | undulating anticline 波状背斜

3. 波状的;起伏的：波状草原 rolling prairie | 波状的;起伏的undulate | 波状地 hammock