是Intel的一个新定义,有规范的 http://en.wikipedia.org/wiki/Ultrabook 简单说: An Ultrabook is a higher-end type of subnotebook defined by Intel. Intel has registered the name as a trademark.[1] Ultrabooks are designed to feature reduced bulk without compromising performance and battery life. They use low -power Intel Core processors, solid-state drives, and unibody chassis to help meet these criteria.[2] Due to their limited size, they typically omit common laptop features such as optical disc drives and Ethernet ports.[3] They were created to compete with Apple's Macbook Air notebooks as the PC's counterpart.