usb host

基本解释

Linux's usbcore kernel module supports USB host controllers and USB devices.
Linux 的 usbcore 内核模块支持 USB 主机控制器和 USB 设备。
Power is supplied by an internal rechargeable battery (lithium-ion prismatic cell), by an external voltage, or through the USB host.
电力由内部充电电池（圆柱形锂电池）、外接电源或 USB 主机提供。
On the other hand, very few PDAs can be configured to work as USB host devices; if you're willing to put in the time and effort, the 770 can use USB hard drives.
另一方面，很少有 PDA 设备可以配置成作为 USB 主机设备来工作；如果您愿意花一些时间和精力，770 甚至可以使用 USB 硬盘。

The last item hints that the iPod photo may in fact have some sort of USB Host capability.
ENGADGET: iPod Camera Connector supports iPod photo only, media readers, and USB host?
Most of the changes to Honeycomb are happening under the hood -- better HTML5 support, faster performance, and USB host functionality for connecting peripherals like game controllers and mice -- but there are some improvements that will be a lot more obvious to the user.
ENGADGET: Android 3.1 on the Motorola Xoom: hands-on (video)
Rather than build a full media hub, ASUS appears to be crafting a possibly Roku-like dongle that would graft Google TV on to a host device through USB.
ENGADGET: blogger-avatar