vacillate
verb [ I ] disapproving uk/ˈvæs.ɪ.leɪt/ us/ˈvæs.ə.leɪt/
踌躇；犹豫；摇摆不定
to be uncertain what to do, or to change often between two opinions
Her mood vacillated between hope and despair. 她时而心怀希望，时而感到绝望。
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。