vacillate between

But Weiner saw no joy in their faces, and reasoned that perhaps it's better to live in this middle range than to vacillate between gleeful moments of elation and gut-wrenching spates of despair.

不过韦纳看不出瑞士人有任何喜形于色的表现，他觉得大概这种中庸平静的生活要比大喜大悲、起落无常要好。

Vacillate between two opinions

在两种意见之间游移不定

Such parents vacillate between saying no and giving in — but neither response seems satisfactory to them.

这类家长举棋不定,对孩子们的无理要求,不知道是该回绝还是该满足,觉得这两者都不理想.

Coetzee's ambivalence is to vacillate between to be or not to be Afrikaner in South Africa.

柯慈的矛盾是来自他排徊于自己是否为南非的荷裔非洲人.

I tend to vacillate between admiration and pity for him.

我对他往往是既钦佩又怜悯。

They vacillate between these two, unable to see that theres a perfect median.

他们在两者之间跳跃，却忽视了其实有一个完美的中间状态。

To vacillate between hope and fear

在希望和恐惧之间踌躇不决

They may dither, and vacillate between denial and acceptance, and this is quite common.

他们可能会踌躇，并且在否认与接受之间犹豫，这很普通。