There has been so much controversy and back and forth on this over many years.

许多年来，这一问题引发了巨大的争议，出现了许多反复。

youdao

The prosecution and defence were bandying accusations back and forth.

原告与被告你来我往，互相指责。

《柯林斯英汉双解大词典》

He and colleagues have shuttled back and forth between the three capitals.

他和同事们一直来回往返于3个首都之间。

《柯林斯英汉双解大词典》

The road moves back and forth and around corners as it moves up the face of the mountain.

VOA: special.2010.09.08

The cookies were going back and forth and back and forth and the hearts up and down, well, this thing that we had that called a loop last week with a forever block with a statement inside of it is simply gonna look a little something like this.

这些饼干人来来回回的移动,还有这些爱心们上上下下地漂浮,都用到我们上周提到过的循环结构,当然还有个声明在里面，就有点像屏幕上,显示的这样。

哈佛公开课 - 计算机科学课程节选

So you can imagine a bead with a wire going through it and the bead can only slide back and forth.

你可以想象一个穿在绳子上的珠子,小珠只能前后滑动

耶鲁公开课 - 基础物理课程节选

She watched as the thread grew, and the bashers and supporters went back and forth.

CNN: She's racing to save the environment

It has been "back and forth, back and forth" between Brigham and Beth Israel.

WSJ: In Boston, Families Grapple With Long Road Ahead

And it just keeps going back and forth, back and forth, and that's why I don't think it's stopping.

NPR: Racial Tensions Overheat at L.A. High School