Undulations
(undulation 的复数) n. 波动, 波状弯曲, 起伏\\n[医] 波动
🗣️ 情景例句
This spring is the origin of the brook.
这泉水是那条小河的源头。
The insect is trapped in the spider's web.
蜘蛛捕捉缠在网上的昆虫。
Together we repeated and repeated words and sentences.
我们一道反反复复地说词语和句子。