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。
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