undulation
US /ˌʌn.djʊˈleɪ.ʃən/
UK /ˌʌn.djʊˈleɪ.ʃən/
名詞
波動
a continuous up and down shape or movement, like waves on the sea:
範例:
•
The fields rise and fall in gentle undulations.
波動
a continuous up and down shape or movement, like waves on the sea: