He was moving back and forth to keep warm and asking for change very softly.

他来回走动取暖，轻声地要些零钱。

youdao

She noticed the other bird moving back and forth on the edge of the cage.

她注意到另一只鸟儿在笼边扑闪着翅膀。

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I've also added a path to follow for moving back and forth — a simple line.

我还添加了一个path作为来回移动的路线——一个简单的线条。

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"If you see a number of scores on a hundred point scale on the 40,50,60 range that suggests that people are moving back and forth.

VOA: standard.2010.02.25

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

He tried to enjoy himself, but all the time he was aware of her moving back and forth between the rooms, not talking to anyone.

NEWYORKER: The Swan

The hardware progression has been from the mainframe to the personal computer to more powerful clustered servers, with cost and access moving back and forth between large enterprises and corporations to small businesses and individuals.

FORBES: How Cloud Computing Can Boost Developing Nations

This rhythmic moving back and forth between a sustained, trance-like state and the adrenaline-packed jolts tends to induce an overall contemplative yet alert state, akin to the feeling one has when driving on a long road trip on uncongested highways.

FORBES: Beware the Peanuts