USB host controllers follow one of two standards: UHCI (Universal host controller Interface) or OHCI (Open host controller Interface).

usb主机控制器遵循两个标准之一：UHCI(通用主机控制器接口)或OHCI(开放式主机控制器接口)。

youdao

Use a USB card reader if your host has no integrated reader.

如果您的主机没有集成读卡器，使用一个US b读卡器。

youdao

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。

youdao