undulation
US /ˌʌn.djʊˈleɪ.ʃən/
UK /ˌʌn.djʊˈleɪ.ʃən/
名词
1.
波动
a continuous up and down shape or movement, like waves on the sea:
示例:
•
The fields rise and fall in gentle undulations.
在 Lingoland 学习这个单词
波动
a continuous up and down shape or movement, like waves on the sea: