Undulations
(undulation 的复数) n. 波动, 波状弯曲, 起伏\\n[医] 波动
🗣️ 情景例句
You've lost your family.
你无家可归了。
Easier said than done.
说话容易做事难。
She became more and more beautiful.
她变得越来越漂亮了。