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
and left ... push ... push ... turn ... hit the floor.
向左……推……推……转身……坐地板。
Never too old (or late) to learn.
学到老,学不了。
Eventually chains were fixed to one end of the dish and a powerful winch was put into operation.