ChiChi ran back and forth in front of his chair, straining at his leash as if to run down the beach.

芝芝在他的椅子前面来来回回地跑，奋力拉扯皮带，似乎想跑下海滩。

youdao

Back and forth, around and around the tower the two run, Donald dashing toward her, as the object of his desire runs to the other side to try to get a better look at him and his flaming crest.

两只鸟儿围着塔楼来来回回，转来转去。 唐纳德向意中人扑了过去，后者跑到另一边，试着换一个角度把追求者的模样和火焰般的羽冠看得更清楚。

youdao

Simply type SFTP destination to connect to the remote machine named destination, and run FTP commands such as CD, LCD, mput, and mget to move files back and forth.

只需输入sftp destination以连接到名为destination的远程计算机，然后运行ftp命令，如cd、lcd、mput和mget以便对文件进行双向移动。

youdao

There was a fun pitch under a huge roof where I had to climb into a corner, then lower myself down the rope and run back and forth on the wall until I could catch the edge of the next crack system.

WSJ: Training for the Big Wall | By Michael J. Ybarra

"If you're an enterprise that is doing just basic text e-mail back and forth, chances are you're not going to run into any problems here, " he says.

CNN: 'Scanner' eyes Y2K problems in e-mail attachments