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He is vacillating between leaving and staying on.
他在去和留之间犹豫不决。
动词vacillate，是一个比较正式的用法，多用来描述那些在两个选择之间摇摆不定的心理状态，介词使用between。
例句：
She vacillated between her two admirers.
在两个追求者之间，她举棋不定。
Such parents vacillate between saying no and giving in.
(对孩子的无理要)，家长们举棋不定，不知道该回绝还是该满足。
