It's the various programs you run on your computer along with the various data files that you have saved on your hard drive,and so forth.

是你自身这个电脑中运行的各种程序,硬盘存有的各种数据和文件，类似种种。

耶鲁公开课 - 死亡课程节选

Their wailing mingled with the sirens of ambulances scurrying back and forth along the route to pick up the dozens who fainted.

CNN: ISOLATED IN THEIR GRIEF

On 1 December the man was traced when rescuers listened to the background noise of the helicopter travelling back and forth along the mountainside to pinpoint his location.

BBC: Helicopter over Snowdonia

There was smoke and a terrible warmth, a gray sun rising and falling in what seemed like a matter of minutes, and the tiger, frenzied, dry-tongued, ran back and forth along the span of rusted bars.

NEWYORKER: The Tiger��s Wife