undulation
n
(a) [U] wave-like movement or appearance 波动; 起伏.
(b) [C] one of a number of wave-like curves or slopes 波状的弯曲或斜坡
The downs fell in gentle undulations to the sea. 这块丘陵地略带倾斜伸向大海.
🗣️ 情景例句
I see her about three times a month.
我一个月见她三次。
To knit a scarf for her sweetheart
替她的情人织围巾
Oh, very well. Then there is nothing to worry about. I apologize. (Hands him the note.)