He paced back and forth.

他来回踱步。

《柯林斯英汉双解大词典》

She passed the needle through the rough cloth, back and forth.

她用针在那块粗布上来来回回地穿进穿出。

《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

These two oscillate back and forth so the moment of deprivation is often then balanced by a moment of imagination.

来回交替丧失的时刻,经常和想像的时刻,互相平衡。

耶鲁公开课 - 1945年后的美国小说课程节选

Because there are ions moving back and forth, there's a current that flows and there's a electrical potential that's generated.

由于离子的进进出出,就产生了电流流动,并且形成了电势差

耶鲁公开课 - 生物医学工程探索课程节选

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

The rocking chair was moving, too: back and forth, back and forth, as if her mother were still in it.

NEWYORKER: Ziggurat