Undulations
(undulation 的复数) n. 波动, 波状弯曲, 起伏\\n[医] 波动
🗣️ 情景例句
Whose woods these are I think I know.
这是谁的林子， 我想我知道。
His apology didn't seem sincere.
他的道歉看起来不是真诚的。
The last question is what to read.
最后一个问题是读什么。