Undulations
(undulation 的复数) n. 波动, 波状弯曲, 起伏\\n[医] 波动
🗣️ 情景例句
Anybody home?
有人在家吗？
The raceis got by running.
赛跑要靠奔跑来赢得。
We'll have to cancel if we don't get that order soon.
如果不能很快拿到货，我们只有取消啦。