Undulations
(undulation 的复数) n. 波动, 波状弯曲, 起伏\\n[医] 波动
🗣️ 情景例句
the reason my apple pie is famous--cinnamon.
我的苹果派就是靠它出名的 肉桂。
Every man is the son of his own works.
种瓜得瓜，种豆得豆。
decided to take some presents to a children's hospital.
盖茨决定送些礼物给儿童医院。