Undulations
(undulation 的复数) n. 波动, 波状弯曲, 起伏\\n[医] 波动
🗣️ 情景例句
It's extremely good of you to do this for me.
你帮我做了这件事，真是太好了。
My uncle had a heart attack last year.
我的叔叔去年患了心脏病。
You are the right man for the job.
你正适合做这项工作