《Operating System Concepts》阅读笔记：p34-p40

《Operating System Concepts》学习第 7 天，p34-p40 总结，总计 7 页。

一、技术总结

1.virtualization(虚拟化)

(1)定义

A technology for abstracting the hardware of a single computer into several different execution environments, thereby creating the illusion that each environment is running on its own private computer.

2.distributed system(分布式系统)

(1)定义

A distributed system is a collection of physically separate, possibly heterogeneous computer systems that are networked to provide users with access to the various resources that the system maintains.

二、英语总结(生词：2)

1.escalate

(1)escalator: escalade(scala, “ladder”) + -ator

c. a moving staircase(自动手扶梯，手扶电梯)。

(2)escalate: back-formation from escalator.

(3)escalation: derived noun from escalate.

vi/vt. to become greater. the roo