To start, stand with one foot in front of the other and shift your weight back and forth (versus around in a circle).

开始时，双脚前后站着，把身体的重量前后甩动（与绕圈甩动不同）。

youdao

Indeed many were surprised how easily and accurately they could tune in to either one of the messages, and even shift their attention back and forth between the two.

的确，许多人很惊讶自己能准确地聆听随便一条讯息是多么地容易，甚至他们能将注意力在两者中来回改变。

youdao

A new algorithm for digital filtration, namely Forth Back digital Filter, is put forward for the need of actual data processing and reduction of the phase shift.

根据实际数据处理工作的需要，以减小信号相移量为目标，提出一种新的数字滤波算法，即所谓往复数字滤波器。

youdao

They all laugh as their eyes shift back and forth between me and their iPhone screens.

FORBES: The Action Movie Blog Post

The hard-edged, almost hyperreal cinematography, by Conrad L. Hall, and the editing, by Tariq Anwar and Chris Greenbury, shift back and forth between dream and actuality with mesmerizing beauty.

NEWYORKER: American Beauty

Independents will shift back and forth, but if they split 49% to 49% (with the rest going to minor candidates), then Mr. Obama's vote total would be shaved by 1.1 million and Mr. Romney's would grow by an equal amount, cutting the president's margin to 1.4 million.

WSJ: Rove: Obama's Shrinking Majority