VERB
犹豫不定;踌躇;拿不定主意
If you vacillate between two alternatives or choices, you keep changing your mind.
例句
She vacillates between men twice her age and men younger than she...
她犹豫不决，不知道是该选择年龄比她大一倍的男人还是比她小的男人。
We cannot vacillate on the question of the party's leadership.
在党的领导权问题上我们不能动摇。