Portable applications (aka portable apps) are programs that you can install on an external hard drive to be run on almost any computer with a USB port.

便携应用(也叫做portable apps)是指可以安装到外部硬盘并通过US b端口在任何电脑上都可以运行的程序。

youdao

He says one of the more popular items is a portable computer from nineteen eighty-one.

VOA: special.2011.02.15

This explains why Transmeta is, initially at least, aiming its products at the portable-computer market.

ECONOMIST: Transmetamorphosis

Its XPS M2010 portable computer is slick, but at 18.3 pounds it's more than a little ungainly.

FORBES: Magazine Article

Portable computer tablets, such as Apple's upcoming iPad, are also part of the equipment of a paperless office.

CNN: Is the 'paperless' office here at last?