Undulates
v. 波动, 起伏, 呈波浪形( undulate的第三人称单数 ); 使波动, 使起伏, 使成波浪形
🗣️ 情景例句
All right.
好。
Two heads are better than one.
集思广益。
What was the population of the less developed countries in 1950?
1950年不太发达国家的人口是多少？