undulate/ˈʌndjuleɪt; ?@ -dʒu-; `ʌndʒəˌlet/ v[I]have a wave-like movement or appearance 波动; 起伏; 呈波浪形 (a field of) wheat undulating in the breeze 在微风中起伏的（一片）麦浪 undulating hills, fields, etc 起伏的山冈、 田野等.
牛津英汉双解词典