1.Software appliances come in the form of a file which can be a virtual machine image, an ISO, a USB key image, or an Amazon EC2 AMI.
软件设备以文件的形式出现，该文件可以是虚拟机映像、ISO、USBkey映像或是AmazonEC2AMI。
2.It is known from the comparison that these technique of USB KEY of HuaHong is advanced in the world .
通过比较可知，华虹的USBKEY产品的这些技术在国际上处于领先地位。
3.Among these systems, the USB Key is used in security control subsystem to identify the user ID;
其中安全控制子系统中采用USBKey，利用数字证书对用户身份进行认证；