Undulations
(undulation 的复数) n. 波动, 波状弯曲, 起伏\\n[医] 波动
🗣️ 情景例句
Do you have any friends in the import or export field?
你有在进出口领域工作的朋友吗？
The car is out of order.
这车子坏了。
Nearly a week passed before the girl was able to explain what had happened to her.
几乎过了一个星期，那姑娘才能讲述自己的遭遇。