A 4g system provides mobile ultra-broadband Internet access, for example to laptops with USB wireless modems, to smartphones, and to other mobile devices.

4g系统提供移动宽带互联网接入，例如与usb无线调制解调器，笔记本电脑，智能手机和其他移动设备。

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You'll be seeing it more as more laptops include a port for it, usually one that can also be used with USB.

你将在越来越多的笔记本上看到它的影子。

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To get the most out of your new network, laptops and ultrabooks can be upgraded with the USB 3.0 ready AC Wi-Fi Dual-Band USB Adapter.

ENGADGET: Belkin outs AC1800 and AC750 dual-band routers, USB WiFi adapter at CES 2013

The next-gen version of the original iRig touts higher quality sound (as the moniker suggests) and now connects via 30-pin or Lightning port for use with a mobile device or via USB for laptops and such.

ENGADGET

Dane-Elec will also be offering USB 3.0-compatible adapters for desktops with PCIe slots and laptops with PCIXpress slots.

ENGADGET: Dane-Elec comes clean with external USB 3.0 HDDs / SSDs